Answer:
20.5%
Explanation:
Hope this helps!!
the cells produced during meiosis are?
Answer:
Meiosis is a type of cell division that reduces the number of chromosomes in the parent cell by half and produces four gamete cells. This process is required to produce egg and sperm cells for sexual reproduction. During reproduction, when the sperm and egg unite to form a single cell, the number of chromosomes is restored in the offspring.
Explanation:
sourced from nature.com
How deep must wells be drilled in order to collect water?
Answer: Sample response:
Wells must be drilled to reach the water table. That depth will depend on the area.
Explanation:
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Which factor is most likely to cause an increase in the number of rabbits living in an area?
A Less water
B fewer predators
C lack of shelter
D limited food
Answer:
B fewer predators
Explanation:
with fewer predators the rabbits can live safely in an area.
How have plants evolved?
Give at least 5 examples.
Answer:
Over time, plants had to evolve from living in water to living on land. In early plants, a waxy layer called a cuticle evolved to help seal water in the plant and prevent water loss. ... To allow the plant to retain water and exchange gases, small pores (holes) in the leaves called stomata also evolved (Figure below)
Explanation:
1 DNA evidence suggests that the first eukaryotes (green plants) evolved from prokaryotes (through endosymbiotic events) between 2500 and 1000 million years ago. ... Cyanobacteria have a close evolutionary relationship with eukaryotes. They have the same photosynthetic pigments as the chloroplasts of algae and land plants.
2Plants adapt their growth, including key steps in their life cycle such as germination and flowering, to take advantage of environmental conditions. ... All land plants evolved from an aquatic ancestor, and it was after colonisation of the land that the gibberellin mechanism evolved.
3 700 million years ago
The researchers found that land plants had evolved on Earth by about 700 million years ago and land fungi by about 1,300 million years ago — much earlier than previous estimates of around 480 million years ago, which were based on the earliest fossils of those organisms.
4 The earliest trees were tree ferns, horsetails and lycophytes, which grew in forests in the Carboniferous period. The first tree may have been Wattieza, fossils of which have been found in New York State in 2007 dating back to the Middle Devonian (about 385 million years ago).
5 Plants adapt to their environment from necessity. Plants may also adapt by growing lower and closer to the ground to shield themselves from wind and cold. Desert environments may have some of the following adaptations, these help the plant to conserve food, energy and water and still be able to reproduce effectively.
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1. Calculate the density of a piece of wood with a volume of 216cm3 and a mass
of 64g
Answer:
Density = Mass/Volume
Density = 216cm3/64g
Density = 3.375 g/cm3
Let me know if this helps!
natural selection is an example of a mechanism of evolution. does this mechanism produce a change in individuals or populations? explain
Natural selection refers to the procedure where the species better amended to their surrounding appear to survive and generate more offspring. Natural selection refers to one of the mechanisms that make modifications in the frequencies of genes in populations and thus, it is the mechanism of evolutionary change.
However, the phenomenon of genetic drift and natural selection cannot take place unless and until there is a genetic variation, that is unless some individuals are genetically distinct from others.
Cells come from other cells. Question 2 options: Sometimes False Never True
Answer:
This statement is true because cells have the capability to divide.
Answer:
It is true
Explanation:
I took the test its right
What will determine whether or not mutations will be passed to offspring?
A catalyst is a ______.
Answer:
a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change.
Answer:
A substance that speeds up chemical reactions.
Explanation:
when a sperm and egg cell combine, the new cell called a zygote contains:
1: 46 chromosomes
2: 23 pairs
3: 22 chromosomes
4: no pairs
Answer:
2, 23 pairs
Explanation:
it is honestly the only one that makes sense
This is for Earth and Space but that wasn't a choice to pick.
Which statement best explains the impact of unfavorable oceanic conditions on human behavior?
1. Boating activities decrease along shorelines.
2. Families move toward shorelines.
3. People spend less time playing at the beach.
4. Recreational water sports increase on beaches.
1. The St. Lucie River drains Lake Okeechobee into the Atlantic Ocean.
What is the relationship among the parts of this system?
Answer:
The St Lucie canal serves as an outlet of drainage for the Okeechobee Lake through the St Lucie River and out to the Atlantic Ocean.
Explanation:
The St. Lucie River is an estuary in Florida, in the United States. It was basically a freshwater system before an inlet was dug to provide access directly to the Atlantic Ocean.
Lake Okeechobee is the second largest freshwater lake in the United States. Water flows into the lake from various sources with Kissimmee River being the major source.
Because of the high levels of water in Lake Okeechobee, the St. Lucie canal was constructed in the 1920s. The St. Lucie canal provides a good outlet from the Okeechobee lake, through the St. Lucie River and out to the Atlantic Ocean.
What is the function of T-lymphocytes? Select all
that apply.
to assist other lymphocytes
to produce other lymphocytes
to kill cells infected with a virus or cancer
to help in the body's immune response
to circulate oxygen throughout the body
Answer:
to assist other lymphocytes
to kill cells infected with a virus or cancer
to help in the body’s immune response
Explanation:
Following are the functions of T-lymphocytes, here:
to assist other lymphocytesto kill cells infected with a virus or cancerto help in the body's immune responseWhat are T-lymphocytes?
T-lymphocytes, also known as T cells, are a type of white blood cell that plays a key role in the immune system. They are produced in the bone marrow and mature in the thymus gland.
One of the main functions of T-lymphocytes is to assist other lymphocytes, such as B cells, in the immune response. They do this by releasing chemicals that help to activate and coordinate the immune response, and by directly attacking infected cells.
T-lymphocytes also have the ability to kill cells that are infected with a virus or cancerous cells. They do this through a process called cell-mediated immunity, in which they recognize and bind to specific proteins on the surface of infected cells. Once they have bound to the infected cells, they release chemicals that kill the cells, helping to prevent the spread of the infection or cancer.
T-lymphocytes are an important part of the body's immune system and play a vital role in helping to protect the body against infections and disease.
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What is an example of capital resource?
O workers
O oil
O machines
O forests
Explanation:
machines ..................................
Explain the process of how air flows through the Respiratory System? In three sentences.
Answer:
The respiratory system is a biological system consisting of specific organs and structures used for gas exchange in animals and plants. The anatomy and physiology that make this happen varies greatly, depending on the size of the organism, the environment in which it lives and its evolutionary history. In land animals the respiratory surface is internalized as linings of the lungs. Gas exchange in the lungs occurs in millions of small air sacs; in mammals and reptiles these are called alveoli, and in birds they are known as atria. These microscopic air sacs have a very rich blood supply, thus bringing the air into close contact with the blood. These air sacs communicate with the external environment via a system of airways, or hollow tubes, of which the largest is the trachea, which branches in the middle of the chest into the two main bronchi. These enter the lungs where they branch into progressively narrower secondary and tertiary bronchi that branch into numerous smaller tubes, the bronchioles. In birds the bronchioles are termed parabronchi. It is the bronchioles, or parabronchi that generally open into the microscopic alveoli in mammals and atria in birds. Air has to be pumped from the environment into the alveoli or atria by the process of breathing which involves the muscles of respiration.
Explanation:
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Which type of organisms do photosynthesis?
Answer:
producers
Explanation:
hope this helps
Answer: Plants, algae, and a group of bacteria called cyanobacteria are the only organisms capable of performing photosynthesis.
Explanation: Because they use light to manufacture their own food, they are called photoautotrophs (literally, “self-feeders using light”).
What would happen if a second universal flood occurs?
Which of the following objects absorbs the most light?
Answer:plants
Explanation:
Answer:
D a wool carpet
Explanation:
is the answer
(a) Describe the process by which cells produce the FGF5 pre-mRNA , and include the location
where the process occurs.
Answer:
Explanation:
mRNA (messanger ribonucleic acid) is produced through the process called transcription in the nucleus. Transcription make ribonucleic acid from deoxyribonucleic acid. The enzyme RNA polymerase creates an RNA molecule that is complementary to the template DNA coping all the information on the DNA into the mRNA formed and 3' to 5' cap are added to stabilize the RNA after which this mRNA then moves from the nucleus where it was produced to the ribosome in the cytoplasm for translation of the information that is coded in the bases.
FGF5 is a gene that is encoded in the DNA.
mRNA is a messenger molecule, which transcribes the information from DNA and delivers it to the RNA.
Role of mRNA Transcription is the process of decoding the message delivered by DNA into a messenger molecule of RNA. The enzyme RNA polymerase is involved in creating the RNA molecule.
FGF-5 gene is produced in the outer root of the hair follicle and perifollicular macrophages. The mRNA produced is complementary to the template DNA and copied all the information of the DNA.
The mRNA is then capped and sent to ribosomes for further translation. The gene is encoded in the DNA.
Thus, transcription is the process in which the mRNA is complementary to the template DNA strand copying all the information.
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Shortage of food plants, erosion of land, and decrease in oxygen levels are all effects of
Immigration
Deforestation
Mining
Trade
Answer:
Deforestation
Explanation:
I took this quiz and got a 100.
8. Outline the process of metaphase, inclusive of the role of microtubules and the centromere.
Answer:
Chromosomes are positioned in the middle of the cell during metaphase.
Explanation:
During metaphase, the centrosomes are at opposite poles or sides of the cell. The spindle apparatus is formed and the nuclear membrane has dissolved. The spindle fibers, also known as microtubules have lined up the chromosomes along the equatorial plate in the middle of the cell so each sister chromatid faces opposite directions. The sister chromatids are still connected by the centromere, and this is the last time they are connected during this division. The centromere is also where kinetochores assemble, and kinetochores are the sites of attachment for microtubules to pull the sister chromatids apart. They are important for the cell to be able to divide.
Which plays a major role in determining which genes are expressed in a cell?
A. transcription factors
B.nothing, it is random
C.translating into spanish
D.your mother
Answer:
A.
Explanation:
A crucial component of controlling transcription is played by proteins known as transcription factors. These crucial proteins aid in identifying the genes that are active in each of your body's cells. Thus, option A is correct.
What is the role of transcription factors?Proteins called transcription factors control the expression of genes. They affect the transcription process, in which DNA serves as a template to create mRNA, which in turn affects protein synthesis.
Since many transcription factors are either tumor suppressors or oncogenes, cancer is linked to their mutations or abnormal regulation.
It is known that three transcription factor groups play crucial roles in human cancer.
Therefore, transcription factors play a major role in determining which genes are expressed in a cell.
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can someone help plssssssssssss
Answer:
Distrupted
Explanation:
the main flow of homestasis was "disrupted" as now some of the cells can't carry out the main bodily funtions.
Answer:
To this Extent - Distrupted
The main flow of homestasis was "disrupted" as now some of the cells can't carry out the main bodily funtions.
A population of rabbits in an ecosystem has genetic variation in fur thickness. Some rabbits have thick fur and others have thin fur. Due to changes in the environment, the average temperature of the ecosystem is steadily increasing.
How will this environmental change likely affect the rabbit population over time?
A. Rabbits with thick fur will become more common in the population because thick fur will be a favorable trait in this changing environment.
B. Rabbits with thin fur will become more common in the population because these rabbits are more likely to survive and successfully reproduce.
C. Rabbits with thick fur and thin fur will become equally distributed because all rabbits in the population will successfully reproduce.
D. Rabbits with both fur types will increase in the population because the temperature change will cause the population of rabbits to expand.
Answer:
B
Explanation:
Thin fur is better for warmer weather, so the rabbits with thinner fur won't over heat in the warming weather.
The population of rabbits n the genetic ecosystem has thick fur and others have thin fur, due to the changes in the climate avg temperature of the ecosystem is steadily falling.
Looking at the situation and adaptive powers or abilities of the animals the thick fur will survive longer than those of the thin fur as the temperature of the place is declining.Hence the option A is correct.
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How many fundamental laws of inheritance did Gregor Mendel come up with?
Answer:
The three laws of inheritance proposed by Mendel include: Law of Dominance. Law of Segregation. Law of Independent Assortment.
Explanation:
Monosaccharides are to carbohydrates as ___
are to proteins.
Answer:
Amino acids
Explanation:
Answer:
AMINO ACIDS
Explanation:
AMINO ACIDS ARE THE MONOMERS OF PROTEINS
All the different organisms that interact in a pond make up
A a community
B the water cycle
C a population
D the habitat
Which of the options below identify the genetic hiearchy in ascending order?
A. Chromosome, Cell, DNA, Gene and Nucleus
B. Gene, DNA, Chromosome, Nucleus and Cell
C. Cell, Nucleus, Chromosome, DNA and Gene
D. None of the above
Answer:
I hope this helps just to let you know this is what I searched just being honest :)
Explanation:
DNA
But your genes also mean that you probably look a bit like other members of your family. For example, have you been told that you have 'your mother's eyes' or 'your grandmother's nose'?
Genes influence what we look like on the outside and how we work on the inside. They contain the information our bodies need to make chemicals called proteins. Proteins form the structure of our bodies, as well playing an important role in the processes that keep us alive.
Genes are made of a chemical called DNA, which is short for 'deoxyribonucleic acid'. The DNA molecule is a double helix: that is, two long, thin strands twisted around each other like a spiral staircase.
27 DNA.gif
The DNA double helix showing base pairs
The sides are sugar and phosphate molecules. The rungs are pairs of chemicals called 'nitrogenous bases', or 'bases' for short.
There are four types of base: adenine (A), thymine (T), guanine (G) and cytosine (C). These bases link in a very specific way: A always pairs with T, and C always pairs with G.
The DNA molecule has two important properties.
It can make copies of itself. If you pull the two strands apart, each can be used to make the other one (and a new DNA molecule).
It can carry information. The order of the bases along a strand is a code - a code for making proteins.
Genes
A gene is a length of DNA that codes for a specific protein. So, for example, one gene will code for the protein insulin, which is important role in helping your body to control the amount of sugar in your blood.
Genes are the basic unit of genetics. Human beings have 20,000 to 25,000 genes. These genes account for only about 3 per cent of our DNA. The function of the remaining 97 per cent is still not clear, although scientists think it may have something to do with controlling the genes.
Chromosomes
If you took the DNA from all the cells in your body and lined it up, end to end, it would form a strand 6000 million miles long (but very, very thin)! To store this important material, DNA molecules are tightly packed around proteins called histones to make structures called chromosomes.
105-Gene-unwrapped.gif
The packaging of DNA into chromosomes
Human beings have 23 pairs of chromosomes in every cell, which makes 46 chromosomes in total. A photograph of a person's chromosomes, arranged according to size, is called a karyotype.
The sex chromosomes determine whether you are a boy (XY) or a girl (XX). The other chromosomes are called autosomes.
106-autosomes.gif
The karyotype of a male human being
The largest chromosome, chromosome 1, contains about 8000 genes. The smallest chromosome, chromosome 21, contains about 300 genes. (Chromosome 22 should be the smallest, but the scientists made a mistake when they first numbered them!).
The DNA that contains your genes is stored in your cells in a structure called the nucleus.
Lipids commonly contain fatty acids. What are the two parts of a fatty acid? Check the correct answers below.
Answer:
I think they are glycerol and carboxyl
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