The cell membrane is a bilayer that is composed of lipids, proteins, and carbohydrates. The two layers of the membrane are made up of phospholipids, which are amphipathic molecules that have a hydrophilic head and a hydrophobic tail.
The hydrophilic heads are located on the outside of the membrane, where they come into contact with water molecules. The hydrophobic tails are located on the inside of the membrane, where they are shielded from water molecules by the hydrophilic heads.
Proteins are embedded in the bilayer, and they play a variety of roles in membrane function. Some proteins are peripheral, which means they are loosely attached to the membrane and can be easily removed. Other proteins are integral, which means they are firmly attached to the membrane and cannot be easily removed.
There are two different types of integral proteins: transmembrane proteins and lipid-anchored proteins. Transmembrane proteins span the entire membrane, while lipid-anchored proteins are attached to the membrane through a lipid molecule.
Proteins can move laterally within the membrane, which means they can move from one side of the membrane to the other. This movement is known as lateral diffusion.
The fluid mosaic model of the membrane describes the membrane as a fluid structure that is composed of a mosaic of different proteins and lipids. This model explains how the membrane can be both flexible and robust, allowing it to perform its many functions.
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the gives us the distinct qualitys that make us human and allows us to think about the future to be playful and creative
Answer:
Brains
Explanation:
the brain gives us the distinct quality that make us human and allows us to think about the future to be playful and creative
2. Compare the environment in which physical weathering is dominant to the
environment in which chemical weathering is dominant.
Answer:
chemical weathering is more dominant in the regions where there is abundant limestone rock.
Explanation:
hope this helps
who is known as the father of taxonomy, who developed our modern system of naming organisms?
Describe how substances that pollute air and water could be harmful to humans and
other living organisms.(4 marks)
Surfaces of water and soil can become contaminated by air pollution. This may cause crop death or lower crop yield. Young trees and other plants can die as a result. Acid rain can be produced when airborne sulphur dioxide and nitrogen oxide particles combine with atmospheric water and oxygen.
What contributes to air pollution?Solid, liquid, and certain gases that are suspended in the air are the main contributors to air pollution. These gases and particles can come from factories, dust, pollen, mould spores, volcanoes, wildfires, and vehicle and truck emissions. Particle pollution, commonly known as particulate matter (PM), is made up of microscopic fragments of solids or liquids in the atmosphere. People are responsible for the majority of air pollution, which manifests as emissions from factories, vehicles, aircraft, or aerosol cans. Air pollution also includes secondhand cigarette smoke. These pollution-causing human activities are referred to as anthropogenic sources. Industry sources, power plants that provide electricity, fossil fuel-powered cars, and other stationary sources all contribute significantly to air pollution.To learn more about pollute air, refer to:
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Substances that pollute air and water can be harmful to humans and other living organisms in a number of ways, such as causing respiratory problems, cardiovascular disease, cancer, etc.
What is pollution and cardiovascular disease?Air pollution can irritate the respiratory system and cause inflammation in the lungs, leading to a range of respiratory problems. For example, particulate matter (tiny particles of dust, dirt, and soot in the air) can cause bronchitis, asthma attacks, and other respiratory problems. Exposure to air pollution has been linked to an increased risk of cardiovascular disease, including heart attacks, strokes, and hypertension, and some air pollutants, such as benzene and PAHs, have been linked to an increased risk of cancer. These pollutants can damage DNA and cause mutations that can lead to cancerous cells.
Hence, substances that pollute air and water can be harmful to humans and other living organisms in a number of ways, such as causing respiratory problems, cardiovascular disease, cancer, etc.
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Alternative forms of a gene having the same position on a pair of homologous chromosomes best describe which of the following? (a) loci (b) phenotypes (c) genotypes (d) alleles.
Alternative forms of a gene having the same position on a pair of homologous chromosomes are best described as alleles. So, option D is correct.
A gene's allele is a variant form that develops via mutation and is present at the same locus on a chromosome. Alleles can exhibit various phenotypes, or observable qualities, depending on how their DNA is sequenced. An individual's genotype is the collection of alleles found in their genome.
The genotype of an individual, which in turn influences their observable traits or phenotypes, is determined by the alleles, which are different variants of a gene that share the same location (locus) on a pair of homologous chromosomes.
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Reason why leopard and lion can't breed yet they belong same genus
Leopard and lion can't breed yet they belong same genus because they do not belong to the same species. Only members of the same species can breed to give rise to offsprings.
These big-cat hybrids don't seem to exist in the wild (or it would be a rare occurrence). When two people of different sexes and species are placed in the same inclosure, they may happen on purpose or by accident. They might quarrel, stay away from one another, become friends, or even bear cubs together.
After mating with a male leopard in Kolhapur, India in 1910, a lioness gave birth to two cubs. One passed away at the age of 2.5 months, while the other was still alive two years later. The crossbreed was given the name leopon. Yet, from what I could gather, they were unable to procreate any further.
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which description is correct regarding how the majority of oxygen is transported to cells and tissues?
The correct description regarding how the majority of oxygen is transported to cells and tissues is by binding to hemoglobin in red blood cells. Oxygen can be transported in the blood in two ways: dissolved in the plasma or chemically bound to the protein hemoglobin in red blood cells.
Hemoglobin is an iron-containing protein in red blood cells that binds to oxygen and carries it from the lungs to the body's tissues and organs. Hemoglobin is the most abundant protein in red blood cells, and each hemoglobin molecule can bind up to four oxygen molecules.
When oxygen binds to hemoglobin, it forms oxyhemoglobin, which is a bright red pigment. This is why oxygen-rich blood is bright red in color.
The majority of oxygen is transported to cells and tissues by binding to hemoglobin in red blood cells. This process is known as oxygen transport, and it is essential for delivering oxygen to all parts of the body.
In summary, the correct description regarding how the majority of oxygen is transported to cells and tissues is by binding to hemoglobin in red blood cells.
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what is the main advantage of live attenuated vaccine?
The main advantage of a live attenuated vaccine is that it provides long-lasting immunity with a single dose. They elicit a potent and enduring immunological response.
Live attenuated vaccines contain weakened or modified versions of the virus or bacteria that cause the disease. Because the vaccine contains a live but weakened organism, it is able to replicate and stimulate a strong immune response in the body, similar to a natural infection, without causing the disease itself.
The immune response generated by a live attenuated vaccine is similar to that generated by a natural infection, including both humoral and cellular immunity. This provides long-lasting immunity to the disease, often with just one or two doses, and may provide protection against multiple strains of the pathogen.
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Photosynthesis is essential to most ecosystems because it produces _____, which are used in cellular respiration by most prokaryotes and eukaryotes.
carbon dioxide and carbohydrates
oxygen and carbohydrates
carbon dioxide and proteins
oxygen and proteins
The choice of the right answer to complete the blank line in the question "Photosynthesis is essential to most ecosystems because it produces ___________, which are used in cellular respiration by most prokaryotes and eukaryotes" os oxygen and carbohydrates. Wich because oxygen and carbohydrates are produced during photosynthesis.
Photosynthesis is the process by which green plants, algae, and some bacteria convert light energy from the sun into chemical energy in the form of organic compounds, such as glucose. During photosynthesis, carbon dioxide and water are used as inputs, and oxygen and glucose are produced as outputs. The process occurs in specialized organelles called chloroplasts, which contain pigments such as chlorophyll that capture light energy. This energy is then used to power the chemical reactions that convert carbon dioxide and water into glucose and oxygen.
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The disaccharide composed of glucose and galactose joined by a glycosidic bond is called
Lactose. A molecule of galactose is combined with a molecule of glucose to form lactose via a 1,4-glycosidic bond. Glucose and galactose combine to form the disaccharide known as lactose.
Two monosaccharide units are joined by glycosidic linkages in either the or orientation to form disaccharides. Lactose, maltose, and sucrose are the three most significant disaccharides. A molecule of glucose and a molecule of fructose are joined to form the compound known as sucrose. Galactose and glucose combine to produce a -14 glycosidic bond, which results in the disaccharide lactose. The formal name of the compound is -D-galactopyranosyl-(1-4)-D-glucose. D-galactose and D-glucose combine to generate 19 distinct disaccharides.
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The peptide portion of any protein without its prosthetic group is called ______. A. Apoprotein B. Preprotein C. Holoprotein D. Euprotein
The peptide portion of any protein without its prosthetic group is called apoprotein.Therefore the correct option is option A.
An apoprotein, also known as an "apo-protein," is a protein that lacks a necessary prosthetic group or cofactor to accomplish its physiological function. An apoprotein refers to a protein that has been stripped of its covalently linked prosthetic group, while a holoprotein refers to a complete protein that includes all of its cofactors or prosthetic groups.
Example: A mature hemoglobin molecule, which contains two alpha globin chains and two beta globin chains, each of which has a heme group attached to it, is an example of a holoprotein. Hemoglobin that lacks heme is referred to as apo hemoglobin, and it cannot bind oxygen. Therefore the correct option is option A.
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Assignment: 04.05 Ancient Greece - Empire of Alexander
The sources mentioned, "Map of Alexander's empire" and "Alexander by the numbers," provide some evidence of Alexander's achievements and influence during his lifetime, which contributes to the argument that he was a great leader.
How can you say Alexander was great?The map of Alexander's empire shows the vast extent of his conquests, which spanned across much of the known world at that time. Alexander was able to defeat powerful empires such as the Persians, which demonstrated his military prowess and strategic genius. His empire also facilitated cultural exchanges between different regions, leading to spread of Hellenistic culture and knowledge.
"Alexander by the numbers" provides numerical data that further emphasizes the scale of Alexander's achievements. Alexander led his army on a march of over 22,000 miles, established over 70 cities, and conquered territories that encompassed over 5 million square miles of land.
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Place the steps involved in the process of bacterial transformation in the correct order.A. Donor cell lysis, B. donor cell binds to receptor site on recipient cell, C. one strand of donor cell DNA is degraded, D. transformed DNA Pairs with homologous region on recipient cell, E. then recombines with recipient cell
Correct order- Lysis of donor cells. The receptor on the recipient cell is tied by the donor cell. There is the degradation of one donor cell DNA strand. transformed DNA forms pairs with the recipient cell's homologous region. then fuses with the recipient cell once more.
For an allogenic transplant, stem cells are obtained from a donor. The patient receives the stem cells from the donor after receiving chemotherapy or radiation therapy. Another name for this is an ALLO transplant. During an ALLO transplant, a lot of people have a "graft-versus-cancer cell effect."
The recipient patient receives healthy stem cells from a healthy donor, which are then replaced by the healthy stem cells in the recipient patient's blood and immune systems. Patients whose bone marrow (stem cell factory) has failed as a result of an illness, chemotherapy, or radiation treatment benefit from stem cell transplants.
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What subgroup of protists swims with one flagellum, are mainly photosynthetic, and are common pond dwellers?a) amoebasb) apicomplexansc) ciliatesd) cellular slime moldse) euglenids
A ubiquitous pond inhabitant, the amoebas subgroup of protists swim with a single flagellum and are mostly photosynthetic. Option a is Correct.
Molds that produce slime are considered protists. It consumes decaying plant matter and the bacteria found there. It inhabits soils, woodlands, sewers, and gutters. A photosynthetic protist is not what it is. Although being categorized as fungi for a very long time, slime molds are now part of the class Myxomycetes and belong to the kingdom Protista (the Protists).
Slime molds exhibit characteristics of both fungi and animals. As a result, they are often referred to as fungus animals. They were classified as protistan fungus by modern scientists. While they are in their amoeboid plasmodial stage, they resemble protozoa and resemble real fungus when they produce spores.
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commercial meat tenderizers contain papain and/or bromelain, both of which are enzymes used to tenderize meat. what type of organic molecules do these enzymes help break down?
Papain and bromelain are both proteolytic enzymes, which means that they help break down proteins. Specifically, they hydrolyze or cleave peptide bonds between amino acids in proteins.
By breaking down the proteins in meat, these enzymes can help to tenderize it, making it easier to chew and digest. Plant enzymes (such as papain, bromelain, and ficin) have been studied extensively as meat tenderizers. Novel plant proteases (actinidin and zingibain) and microbial enzyme preparations have recently piqued the interest of researchers due to their ability to manage meat tenderization and other benefits.
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how does the life cycle of an average-sized star differ from the life cycle of a high-mass star?
The life cycle of an average-sized star like the sun starts with the collapse of a cloud of gas and dust under the force of gravity.
As the cloud collapses, it becomes more massive and heats up, eventually reaching a temperature and density that allow nuclear fusion reactions to occur in its core. These fusion reactions convert hydrogen into helium, releasing energy in the form of light and heat.
This phase called the main sequence, can last for billions of years, during which the star is stable. In contrast, high-mass stars have a much shorter lifespan and a more explosive end. Due to their high mass, they burn through their fuel at a much faster rate, causing them to evolve more quickly.
They also undergo a series of nuclear fusion reactions, creating heavier elements in their cores. Eventually, these stars will run out of fuel, and the core will collapse. This collapse triggers a supernova explosion that can be more than 10 times brighter than an average-sized star. After the explosion, the core may collapse further, forming a black hole or a neutron star.
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what is the primary function of carbohydrates? group of answer choices serve as an important component of muscle. provide texture and flavor to foods. promote chemical reactions within cells. supply energy to body cells.
Carbohydrates are the sugars, starches, and fibers present in fruits, grains, vegetables, and milk products. These are one of the main sources of energy for the body. Carbohydrates are essential macronutrients that have a wide range of biological and physiological benefits for the body, including supplying energy: Carbohydrates supply the body with glucose, which is then converted into energy in the form of ATP. This energy is used by the body for various purposes including physical activity, metabolic processes, and internal functions such as circulation and breathing. Preventing the breakdown of protein: If insufficient carbohydrate is available, the body can use protein for energy, resulting in the breakdown of muscle tissue.Assisting in metabolic functions: Carbohydrates help to regulate metabolic functions such as the metabolism of fats and proteins. They also play a role in insulin regulation and cholesterol metabolism.
Carbohydrates are the body's primary energy source.
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Baroreceptors in the brain detect blood pressure, and osmoreceptors detect salt concentration in the blood. When changes occur, these receptors send signals to the pituitary to stimulate or inhibit antidiuretic hormone (ADH) release. If a man becomes lost in a desert without water, the receptors in his brain detect changes to his blood pressure and salt levels in his blood that signal the release of ADH into his bloodstream. Predict how the release of ADH will affect his kidneys and his blood vessels. A. Water reabsorption by kidneys and vasoconstriction of blood vessels B. Water reabsorption by kidneys and vasodilation of blood vessels C. Water excretion by kidneys and vasodilation of blood vessels D. Water excretion by kidneys and vasoconstriction of blood vessels
Water excretion by kidneys and vasodilation of blood vessels. Therefore, option (C) is correct.
The brain's receptors will notice variations in blood pressure and salt levels if a man becomes stranded in a desert without water, which will cause the release of antidiuretic hormone (ADH) into his circulation.
ADH, often referred to as vasopressin, works on the kidneys to boost water absorption and decrease water loss through urine production. To preserve water and stop additional dehydration, ADH release will be reduced in the absence of water. The kidneys will expel more water as a result, increasing urine production and reducing water absorption.
ADH is also involved in controlling blood vessel diameter. In this case, the release of ADH will lead to blood vessel dilatation. Despite the limited water supply, vasodilation aids in boosting blood flow to essential organs in an effort to maintain appropriate blood perfusion.
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What is the pair of chromosomes inherited from the mother and the other pair from the father?
A pair of chromosomes inherited from the mother and the other pair from the father is called a homologous chromosome pair.
Homologous chromosomes are similar in size, shape, and gene content and carry the same genes at the same loci, although the specific alleles may differ. In humans, the homologous chromosome pairs form the 23 pairs of chromosomes that contain the genetic material necessary for the development and functioning of the organism.
During sexual reproduction, each parent contributes one set of chromosomes, including one member of each homologous chromosome pair, to their offspring. The process of meiosis ensures that each gamete receives one member of each homologous pair, resulting in genetic diversity in the offspring.
This means that the genetic material inherited from the mother and father are combined in their offspring, leading to genetic variation within a population. The study of homologous chromosomes is essential for understanding genetics, inheritance patterns, and evolutionary biology.
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dna choose... joins choose... to synthesize a new choose... dna strand.
DNA polymerase is an enzyme that joins nucleotides to synthesize a new DNA strand during DNA replication.
The process begins with the separation of the double-stranded DNA molecule into two separate strands by an enzyme called helicase. One of the strands serves as a template for the synthesis of a new complementary strand. DNA polymerase reads the template strand and matches complementary nucleotides to it, adding them one by one in the 5' to 3' direction.
As each nucleotide is added, DNA polymerase catalyzes the formation of a phosphodiester bond between the 3' end of the growing DNA strand and the 5' phosphate group of the new nucleotide. This process continues until a complete new DNA strand has been synthesized.
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4. Why are geographic information systems useful to farmers? What do you think the
pluses and minuses would be of adopting this technology?
GIS in agriculture enables improved management of land resources, which enables farmers to enhance productivity while lowering expenses.
What role does the geographic information system have in farming?Farmers can map field data, organise and analyse it, and remotely monitor their crops thanks to the usage of GIS in agriculture. Farm automation has benefited from advances in satellite monitoring, robots, drones, and GPS. These technologies support the gathering of GIS data.
What benefits come from utilising a geographic information system?By producing maps and scenes, GIS users may arrange, display, and analyse many layers of data. Users may find patterns, comprehend trends, keep track of changes, and react to events with the help of clear visualisation of various types of data, enabling improved decision-making.
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Which of the following are produced by reactions that take place in the thylakoids and are consumed by reactions in the stroma?
a. CO2 and H2O
b. NADP+ and ADP
c. ATP and NADPH
d. glucose and O2
ATP and NADPH are produced by reactions that take place in the thylakoids and are consumed by reactions in the stroma. Thus, the correct option will be C.
What is a thylakoid?The thylakoid is a membrane-bound compartment located in the chloroplasts of eukaryotic cells, and is the site of the light-dependent reactions of photosynthesis. These reactions take place in the thylakoid membranes and convert light energy into chemical energy, which is used to power the Calvin cycle (light-independent reactions) that takes place in the stroma.
The reactions in the thylakoids lead to the formation of ATP (adenosine triphosphate) and NADPH (nicotinamide adenine dinucleotide phosphate), both of which are essential for the light-independent reactions (Calvin cycle) that take place in the stroma. They are the products of photosynthesis that are used to convert carbon dioxide into glucose and other sugars.
Therefore, the correct option is C.
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What part of the temporal bone does the mandible articulate with what is the name of this joint?
The mandible, or lower jaw bone, articulates with the temporal bone of the skull to form the temporomandibular joint (TMJ).
Specifically, the mandibular condyle, a rounded projection on the posterior aspect of the mandible, articulates with the mandibular fossa, a depression on the temporal bone located just in front of the ear canal. The TMJ is a synovial joint, meaning it contains a synovial fluid-filled cavity that allows for smooth movement of the joint.
It is a highly mobile joint, enabling functions such as chewing, speaking, and yawning. Dysfunction of the TMJ can result in pain, clicking, or limited movement of the jaw, a condition known as temporomandibular joint disorder (TMD).
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which of the following statements is most accurate select an answer and submit. for keyboard navigation, use the up/down arrow keys to select an answer. a hydrogen ions released during lactate production are primarily responsible for blood acidosis b an accumulation of adp during exercise will inhibit creatine kinase activity. c during exercise, glycogen stored in non-exercising muscles help preserve blood glucose levels. d in non-muscle cells, lactate an be converted back to glucose, implying that it is an energy source.
The correct answer is during exercise ,glycogen stored in non-exercising muscles help preserve blood glucose levels.
During exercise, glycogen is stored in non-exercising muscles help preserve blood glucose levels. Glycogen is a storage polysaccharide in animals that is composed of glucose molecules. It is stored in the liver and muscles and is used to provide energy during periods of intense physical activity or fasting. Therefore, during exercise, glycogen stored in non-exercising muscles help preserve blood glucose levels.
This statement is most accurate as blood glucose levels are crucial to maintain energy production during exercise. Glycogen is broken down to release glucose that helps to keep the glucose levels up during the exercise. Hence, the statement "During exercise, glycogen stored in non-exercising muscles help preserve blood glucose levels" is the most accurate statement among the given options.
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What is a similar structure in different species that evolved separately called?
The similar structure in different species that evolved separately is called a convergent structure.
The term “convergent structure” refers to the process by which distinct species with different ancestors develop similar structures, either through adaptation to similar environmental conditions or similar ecological roles.
This phenomenon, known as convergent evolution, typically results in different organisms developing similar adaptations to solve the same problem.
Both structures have evolved to perform the same task (flight), and both have independently evolved to do so due to selective pressure in a specific habitat.
A similar structure, shared by different species, is termed homology when it is derived from a common ancestor, and analogy when it is not.
The similarity between bat wings and bird wings is a classic example of analogy, since these structures did not evolve from a common ancestral structure but instead emerged independently in response to selective pressure.
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The receptor sites where THC binds to produce its effect are found in large numbers in the brain area considered to be the seat of human consciousness, which is the
a. reticular activating system.
b. limbic system.
c. prefrontal cortex.
d. medulla-pons region.
The receptor sites where THC binds to produce its effect are found in large numbers in the brain area considered to be the seat of human consciousness, which is the limbic system.
The limbic system is the part of the brain that is responsible for regulating emotions, memories, and motivational behavior. The hypothalamus, hippocampus, and amygdala are some of the brain regions that make up the limbic system. The limbic system is the seat of our emotions and plays a critical role in learning and memory.
The receptors sites of THC bind with the cannabinoid receptors that are located in the brain areas such as the limbic system and hence produce the effect of THC. This effect of THC is due to the activation of the endocannabinoid system. THC stands for Tetrahydrocannabinol which is a psychoactive component found in the cannabis plant. THC is responsible for producing the high feeling when a person smokes or ingests cannabis products
The use of cannabis and THC has medical uses as well. It can be used to treat chronic pain, nausea, glaucoma, multiple sclerosis, epilepsy, and cancer. THC has potential therapeutic effects but it is also considered as a recreational drug because of its psychoactive effects.
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Why is fermentation a required pathway for providing cellular energy when oxygen is unavailable or in insufficient supply? NAD is not regenerated by the electron transport chain. ATP production requires oxygen. NADH cannot be reduced to NAD Cells need either lactic acid or ethanol when oxygen is low, Lactic acid or ethanol can be used to generate oxygen.
Fermentation is a crucial pathway for providing cellular energy when oxygen is unavailable or in insufficient supply, as it allows cells to continue generating ATP by regenerating NAD+ and allowing glycolysis to continue.
Because it enables the regeneration of the oxidized form of the electron transport molecule NAD+, which is necessary for glycolysis to proceed, fermentation is a necessary mechanism for supplying cellular energy when oxygen is missing or in inadequate supply. Pyruvate is produced from glucose during glycolysis, and NAD+ is reduced to NADH. The electron transport chain's ability to convert NADH back into NAD+ in the presence of oxygen permits glycolysis to continue creating ATP. The electron transport chain, on the other hand, is unable to work when oxygen is lacking or insufficiently present, and NADH builds up, which can inhibit glycolysis.
By oxidizing NADH back to NAD during fermentation, NAD+ can be replenished, allowing glycolysis to continue generating ATP. Certain cells, like muscle cells and some microbes, can employ fermentation to make lactic acid or ethanol as end products in the absence of oxygen, allowing them to generate ATP without the need for oxygen.
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Select the correct statement about the Evolution of Animals.
1 The oldest generally accepted fossils of large a
2 No animal fossils are found in strata formed bef
3 Approximately half the phyla of living organisms
4 All the above
The oldest generally accepted fossils of large animals range in age from 565 to 550 m. Option A
What is evolution in animals?Evolution in animals refers to the process of change in the inherited characteristics of a population of animals over time, which occurs through the mechanisms of natural selection, genetic drift, gene flow, and mutation.
Evolution occurs when some individuals in a population possess advantageous traits that allow them to survive and reproduce more effectively than others, resulting in the gradual accumulation of these traits in the population over generations.
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simple spinal reflexes occur independent of the brain.truefalse
Simple spinal reflexes occur alone in the brain. Harm to the ventral foundation of a spinal nerve would imply that the tactile gift of the reflex circular part would be raided. For the spinal cord to process a reflex arc, interneurons must be involved. The correct answer is true.
Control centers in the brain have a significant impact on spinal reflexes. Axons originate in a variety of brainstem and cerebral cortex centers and synapse primarily with spinal interneurons, with some providing direct input to motor neurons.
The brain does not participate in a reflex action. These automatic actions are controlled by the spinal cord, which response to stimuli without considering how to respond. The brain does not respond in any meaningful way to it.
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Select the parts that make up the backbone of the DNA molecule. Select the TWO answers that are correct. a. sugar b.glycine c.nucleoside d.phosphate e.nitrogenous base
The backbone of the DNA molecule is composed of sugar and phosphate groups. These components are connected by phosphodiester bonds, which alternate to form a long chain.
The correct answers to the question “Select the parts that make up the backbone of the DNA molecule” are a. Sugar and d. Phosphate. Sugar (deoxyribose) and phosphate molecules are the two primary components of the DNA backbone. The sugar and phosphate molecules alternate to form the long chain that makes up the backbone. The nitrogenous base, which is bonded to the sugar, extends away from the backbone and pairs with its complementary base on the opposite strand to form the DNA molecule's double helix structure. Nucleoside is a combination of a sugar molecule (ribose or deoxyribose) and a nitrogenous base. These components are used to create nucleotides. Glycine is an amino acid, which is a component of proteins, not DNA. The nitrogenous base is bonded to the sugar and extends away from the backbone, as mentioned above. However, it is not a component of the backbone itself, so it is not a correct answer to this question.
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