There are two types of cells, prokaryotic and eukaryotic. The first prokaryotic cell fossil records date back to about 3.5 billion years ago, while the first cells resembling eukaryotes appear about two billion years later. Although the types of cell share some similarities, compartmentalization is not a shared characteristic.


1. Describe the endosymbiotic theory.
2. Explain the relationship between the functions of endosymbiotic organelles and their free-living ancestral counterparts. Provide evidence that supports the endosymbiotic theory.

Answers

Answer 1
1. The endosymbiotic theory is a scientific hypothesis that explains the origin of certain organelles within cells. Specifically, the endosymbiotic theory suggests that certain organelles, such as mitochondria and chloroplasts, were once free-living prokaryotic cells that were engulfed by larger host cells. These smaller cells were eventually able to survive and reproduce within the host cell, forming a symbiotic relationship. Over time, the host cell and the engulfed cell became increasingly dependent on each other, and the engulfed cell lost its ability to survive and reproduce on its own.
2. The functions of endosymbiotic organelles are closely related to the functions of their free-living ancestral counterparts. For example, mitochondria are responsible for generating energy within cells through the process of cellular respiration, a function that is also performed by certain types of prokaryotes. Chloroplasts, which are found in plant cells and some other eukaryotes, are responsible for photosynthesis, a process that is also carried out by certain types of photosynthetic prokaryotes.

There is strong evidence that supports the endosymbiotic theory. For example, mitochondria and chloroplasts have their own DNA and ribosomes, which are similar to those found in prokaryotes. Additionally, the genetic code used by mitochondria and chloroplasts is more similar to the genetic code used by prokaryotes than it is to the genetic code used by the host cell. These and other observations support the idea that these organelles were once independent prokaryotic cells that became integrated into larger host cells through a process of endosymbiosis.

Related Questions

What is the base sequence on the messenger RNA (mRNA) molecule transcribed from it?
A. TGG CAC GTC CTA
BTGG CUC GTC CTU
C. UGG CTC GUC CUT
D. UGG CAC GUC CUA

Answers

Dujeuuuiuiiii. . …… .

In chloroplasts, _____ is the source of the electrons needed for photosynthesis.

Answers

Answer: In chloroplasts, water is the source of the electrons needed for photosynthesis.

Explanation:

Hope that helps

Why are the differences between prokaryotic and eukaryotic translation of mRNA useful to humans?

Answers

For the regulation of genes during nutritional shortage and stress, development and differentiation, nervous system function, aging, and illness, translational control in eukaryotic cells is essential. Prokaryotes are able to respond quickly to environmental cues because transcription and translation happen simultaneously in the cytoplasm.

what are Prokaryotes ?

Any organism without internal membranes is referred to as a prokaryote, usually written procaryote. These organisms lack a defined nucleus and other organelles.

what is eukaryotic ?

eukaryotic can be explained as a living things with nuclei in their cells. Eukaryotes include all animals, all plants, all fungi, and many unicellular creatures.

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Select all true statements regarding gamma decay.

Answers

Gamma rays are the spectral particles with the highest energy and shortest wavelength. This form of decay does not result in the release of any particles from the nucleus.

What is a nucleus, and what does it do?

The spindle holds the alleles, which are the structures that house the genetic traits, and governs and regulates the functions of the cell. The nucleoplasm is the gel-like membrane that contains the nuclear parts are suspended.

Why is the nucleus the most significant cell?

Due to its role in the storage, retrieval, and copying of genetic material, the nucleus is regarded as among the most significant components of eukaryotic cells. The genetic material is housed in an organelle with two membranes.

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in a story of a small village, one of the characters is described as a round, bubbly woman who bakes treats for all the children. what somatotype would this character be?

Answers

In the story of a small village, the character who is described to be round and bubbly and has a habit of baking treats for everybody would be of an endomorph somatotype.

Somatotypes are founded on the idea that every person has a certain body type at birth. Skeletal structure and body composition are expressions of one's body type, or somatotype, which is inherited. The endomorph body type is characterized by a higher proportion of fat and muscle.

Despite being hefty, these individuals are not always fat. If you have an endomorph body type, you are aware of how difficult it is to grow muscle mass and shed weight. You may obtain optimum health and fitness by following specialized diet and exercise routines. Endomorphs have more supple, curved bodies.

They may or may not be overweight, but they have wide hips, a huge frame, and wide shoulders. Their lower belly, thighs, and hips frequently carry the majority of their weight.

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what number and types of chromosomes are found in a human somatic cell? what number and types of chromosomes are found in a human somatic cell? 21 autosomes and 2 sex chromosomes 45 autosomes and 1 sex chromosome 22 autosomes and 1 sex chromosome n chromosomes 44 autosomes and 2 sex chromosomes

Answers

There are 44 autosomes and two sex chromosomes in each person. Human somatic cells have 22 pairs of autosomes and either two X chromosomes or an X and a Y chromosome.

A chromosome is a long molecule of DNA that contains the genetic material of various organisms. Most eukaryotic chromosomes exist in tandem with histone proteins, which aid in DNA stability.

Each chromosomal pair is made up of one chromosome from the mother and one chromosome inherited from the father. Human males produce gametes with two types of sex chromosomes, X and Y, whereas human females produce gametes with only one type of sex chromosome, X.

The male gamete is referred to as heterogametic or heteromorphic, while the female gamete is referred to as homogametic or homomorphic, depending on the gamete produced. The number of chromosomes varies from organism to organism, but they are an important part of the cell because they not only impart essential qualities to the organism and also aid in the synthesis of important proteins which play important metabolic roles, resulting in the organism's proper functioning.

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The founder effect is an example of _______.

Answers

Answer:

The founder effect is an example of genetic drift

explanation:

A population has members with the same appearance and features, such members encounter similar problems in the environment they live in. Some members of the population start living in a different place due to some reason. In that new area, they form a colony and start to adapt to different environments. This is called the founder effect. This brings change into sets of genes causing genetic drift.


What environmental parameters would need to be monitored as DDT



Answers

Answer:

1. Soil and water samples for levels of DDT and its metabolites

2. Air samples for levels of DDT and its metabolites

3. Sediment samples for levels of DDT and its metabolites

4. Biological samples for levels of DDT and its metabolites

5. Surface water run-off for levels of DDT and its metabolites

6. Aquatic life for levels of DDT and its metabolites

7. Plant life for levels of DDT and its metabolites

8. Temperature and pH levels in the environment

9. Wind speed and direction

10. Rainfall levels

7. suppose a scientist discovers a gene that he believes promotes pluripotency. how could he test this possibility?

Answers

suppose a scientist discovers a gene that he believes promotes pluripotency. he could test this possibility by depleting it from the somatic nucleus to see if nuclear reprogramming becomes less efficient

What is Pluripotency?

The capacity of some substances to elicit a variety of unique biological reactions is referred to as the pluripotency of biological molecules. As with pluripotent stem cells' ability to differentiate into several cell types, pluripotent is also used to denote something that has no predetermined developmental potential.

What makes anything pluripotent?

A term with several "potentials" is plural. In other words, these cells have the capacity to transform into all more than 200 different cell types in the body. Both induced pluripotent stem (iPS) cells, which are reprogrammed from adult tissues, and embryonic stem cells are pluripotent.

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Complete question:

Suppose a scientist discovers a gene that he believes promotes pluripotency. How could he test this possibility?

a. Transduce it into somatic cells with Oct4, Sox2, c-myc, and Klf4 to see if nuclear reprogramming becomes more efficient

b. In a somatic cell nuclear transfer experiment, deplete it from enucleated eggs to see if nuclear reprogramming becomes less efficient

c. In a somatic cell nuclear transfer experiment, deplete it from the somatic nucleus to see if nuclear reprogramming becomes less efficient

d. In a somatic cell nuclear transfer experiment, deplete it from enucleated eggs to see if nuclear reprogramming becomes more efficient

e. Two of the above answers are correct

which of the following will occur after ovulation? group of answer choices the corpus luteum prepares to become a corpus albicans. the corpus luteum secretes estrogen only. the endometrium enters its secretory phase. the secretion of anterior pituitary gonadotropins is enhanced.

Answers

The interaction of hypothalamic and anterior pituitary hormones with reproductive tissues and organ hormones regulates the human male and female reproductive cycles. In both sexes, the hypothalamus regulates and causes pituitary hormone release.

The normal menstrual cycle is a sequential event in which the hypothalamus secretes GnRH, the pituitary gland secretes follicle stimulating hormone and luteinizing hormone (LH), and the ovary responds to those hormones by recruiting a dominant follicle and secreting estradiol and inhibin A. Estradiol stimulates cervix endometrial proliferation and mucus production. A peak in estradiol causes the release of LH, which is responsible for ovulation and the subsequent secretion of progesterone by the corpus luteum, which involutionates 14 days later if not stimulated by hCG (pregnancy). Normal menstrual cycles last 28 days, with a two-day fluctuation in the same woman considered a normal pattern or a regular cycle. The normalcy of these events would allow for successful embryo implantation in the case of trying to conceive. To be fertilized, a capable spermatozoon must reach an adequate ovule during the ovulatory stage. The spermatozoon can survive for up to 5 days in the feminine genital ractum , but the ovum can only be fertilized for 12-24 hours. Fecundation takes place in the distal third of the fallopian tube, and the fecundated zygote develops into a morula before being implanted at the endometrium four days later.

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an oversimplified or exaggerated generalization used to describe or distinguish a group is called

Answers

Answer: An oversimplified or exaggerated generalization used to describe or distinguish a group is called a stereotype.

scientists understand that viruses have advanced greatly in the last 50 years. which statement gives evidence that a virus is non living.

Answers

Answer:

Reproduction.

Explanation:

One piece of evidence that a virus is non-living is that it cannot reproduce on its own.

Unlike living organisms, viruses require a host cell to replicate and produce more viruses.

This dependence on a host cell for reproduction suggests that viruses are not truly alive, as they lack one of the key characteristics of living things, which is the ability to independently sustain and replicate themselves.

Which of these shows an example of an insertion mutation?

Answers

The figure 3 shows an example of an insertion mutation.

What do you mean by insertion mutation?

An insertion is the addition of one or more nucleotide base pairs into a DNA sequence. This can often happen in microsatellite regions due to the DNA polymerase slipping.

Moreover, an insertion changes the DNA sequence by adding one or more nucleotides to the gene. As a result, the protein made from the gene may not function properly.

An insertion mutation occurs when an extra nucleotide is added to the DNA strand during replication. This can happen when the replicating strand "slips," or wrinkles, which allows the extra nucleotide to be incorporated.

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NEED HELP ASAP I WILL GIVE 50 POINTS!!!

Which organisms have cells that use mitochondria to release energy stored in food?

A: Self feeders

B: Neither self feeders nor other feeders'

C: Other feeders

D: Both

Answers

Answer:

D. Both self feeders(plants) and other feeders(animals and microorganism)

Explanation:

The membrane-enclosed organelles are mitochondria, which are present in the cells of virtually all eucaryotic organisms (including fungi, animals, and plants), and plastids—most notably chloroplasts—which occur only in plants.

I hope this helped

Answer: D. Both self feeders(plants) and other feeders(animals and microorganism)

Explanation:

      .

in 2020 the united states department of agriculture reported that 13.8 million people in the united states were food insecure. food insecurity is a disruption of eating patterns due to lack of resources. in some large cities where residents have very little access to nutritious food options, empty lots are being purchased in the neighborhoods for residents to utilize for community gardens. these gardens will collectively be cared for by the community and the harvests will be available to community members. what is a social consequence of this sustainable use of land?

Answers

The social consequence of sustainable use of land is that it lead to:

Poverty reductionSocial investmentSafe and caring communitiesWhat is land usage that is sustained?

Sustainable land management (SLM), according to the United Nations, is the "use of land resources, including soils, water, animals, and plants, for the production of goods to satisfy changing human requirements, while concurrently safeguarding the long-term productive potential of these assets

The health of our social and economic system depends on the land. Land controls the flow of water and nutrients, maintains biodiversity, stores carbon, and offers resources to businesses as well as jobs and food for individuals when it is properly and sustainably maintained.

Therefore, In order to meet human needs both now and in the future, sustainable land use provides a fair and balanced distribution of land, water, biodiversity, and other environmental resources among the numerous competing claims.

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VERY IMPORTANT WILL MARK
2. Which extreme organism is the most extreme? Why?

Answers

Answer:

Extremophilic microbes

Explanation:

The Most Extreme Creatures Extremophilic microbes are a wild bunch. They can be found thriving in some of the most hostile environments imaginable - swimming in near-boiling water, eating rocks, lounging in sub-zero temperatures, and hanging out where radiation levels rival nuclear reactors.

which autonomic ganglion, located anterior to the ear, receives parasympathetic axons from the glossopharyngeal nerve (cn ix)?

Answers

Parasympathetic, sympathetic, sensory, and motor roots can all be found in the otic ganglion.

All branches of the mandibular division of the trigeminal nerve receive postganglionic parasympathetic secretomotor fibres from the otic ganglion. Additionally, the parotid gland receives sympathetic vasomotor fibres from it. The infratemporal fossa's medial side and the tiny parasympathetic ganglion known as the otic ganglion are both situated just below the foramen ovale. It functions as the glossopharyngeal nerve's functional partner and innervates the parotid gland to stimulate salivation. The auriculotemporal nerve most likely sends signals to the superficial temporal artery from the otic ganglia. Because migraine attacks involve the superficial temporal artery, this is clinically intriguing.

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When there is no pattern to a
population's growth, it is known as
A. cyclical
C. irruptive
B. declining
D. irregular

Answers

Answer: D. irregular

Explanation:

What is translation ​

Answers

Answer: Translation is the process in which ribosomes in the cytoplasm or endoplasmic reticulum synthesize proteins after the process of transcription of DNA to RNA in the cell's nucleus.

Explanation: Hope this was helpful

which division of the piriform cortex produces representations of the features of odorant molecules?

Answers

The anterior division of the piriform cortex produces representations of the features of odorant molecules.

Piriform cortex is a region of the brain also called as pyriform cortex, situated in the cerebrum region. Its function is to regulate the mechanisms of the olfactory experiences. It is at the junction of the temporal and frontal lobes.

Odorant molecules are the ligands that bind to the odorant receptors present at the neurons of the body involved in the olfactory responses. They are names odorants because they perceive smell. The receptors of the odorant molecules are GPCRs. Odorants are of various types based on the type of functional group they possess.

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Which technology below would probably be the most important to a person who had diabetes and had to take insulin every day?

Answers

If a person has diabetes and has to take insulin every day, the most important technology for them would likely be a device for administering insulin, such as a insulin pump or a pen injector. These devices allow the person to easily and accurately administer the insulin they need in order to manage their diabetes. In addition, they may also benefit from other technologies such as glucose monitoring devices and apps that can help them track and manage their condition.
Using recombinant DNA to produce human hormones from bacteria.

A primary difference between transcription and replication is that transcription

Answers

Answer: Replication is the duplication of two-strands of DNA.

Explanation:

Transcription is the formation of single, identical RNA from the two-stranded DNA.

Transcription and replication are two closely related processes that are essential for the functioning of cells. However, they are not the same thing and have some important differences.

Transcription is the process by which the information in a gene is copied into a molecule of RNA. This involves the enzyme RNA polymerase binding to a specific sequence on the DNA molecule and using the information in the DNA to synthesize an RNA molecule that is complementary to the DNA. Transcription is the first step in the process of gene expression, which is the way that cells convert the information in genes into proteins and other functional molecules.

Replication, on the other hand, is the process by which cells make copies of their DNA. This is necessary for cells to divide and produce new cells, and it also plays a crucial role in maintaining the integrity of the genetic information over time. Replication involves the enzyme DNA polymerase binding to the DNA molecule and using it as a template to synthesize new strands of DNA. This process results in two identical copies of the DNA molecule, one for each of the daughter cells that will be produced during cell division.

In summary, the primary difference between transcription and replication is that transcription involves the synthesis of RNA from DNA, whereas replication involves the synthesis of DNA from DNA. Transcription is a crucial step in gene expression, whereas replication is essential for cell division and the maintenance of genetic information.

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imagine you discovered two new species of fish. one has internal fertilization and the other fertilizes eggs externally. in both species, only one adult provides parental care for the eggs in a nest. in which species is paternal care more likely to have evolved and why? (20 points)

Answers

A female egg is fertilized by a male sperm outside of the female's body. This process of reproduction is known as external fertilization. parental care for the eggs in a nest. in which species is paternal care more likely to have evolved

More than 33 000 species of bony fish use external fertilization, a general phrase that refers to the discharge of sperm and eggs into the environment outside of the body. This process can range from broadcast spawning to the direct sperm attachment to eggs. Which species develops inside while being internally fertilized?

Fertilization Within

Most bony fish, numerous reptiles, some cartilaginous fish, the majority of amphibians, two mammals, and all birds exhibit this. Eggs from reptiles and insects are leathery, whereas eggs from birds and turtles have a lot of calcium carbonate in the shell, making them hard.

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do all living things have the same number of genes?

Answers

The end outcome is the biodiversity we are familiar with today. However, it is impossible to directly compare species because their genes are varied and they do not all have the same number of genes.

Does each individual possess the same number of genes?

Does everyone share a genome? Most people have a similar human genome. The genome does, however, contain variants. Differences in look and health are a result of this genetic variation, which makes up roughly 0.001 percent of each person's DNA.

Do all forms of life have genes?

All plants and animals are composed of cells, and those cells contain genetic material in the form of genes and chromosomes (usually in the nucleus).

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HELPPPPPPPPPPPPP helpppppppppp

Answers

Answer:

"Plasma membrane monoamine transporter (PMAT) Four phases of mitosis: prophase, metaphase, anaphase, and telophase."

PMAT is the order of the phases of mitosis.

The answer is C.

P- prophase
M- metaphase
A- anaphase
T- telaphase

How do scientists study the interactions and flow of matter and energy within and between earths

Answers

by watching the the currents of energy closely

Which of the following is a characteristic of offspring produced by meiosis, and does not characterize offspring produced by mitosis?

A.
four haploid cells with chromosomes and alleles that are genetically different than the parents

B.
four haploid cells with chromosomes and alleles that are genetically identical to the parents

C.
two diploid cells with chromosomes and alleles that that are genetically different than the parents

D.
two diploid cells with chromosomes and alleles that are genetically identical to the parents

Answers

Answer:

the answer is B I did this last week

a branch of the autonomic nervous system that prepares the body for activity by speeding up the heart rate is called the system.

Answers

The sympathetic branch of the autonomic nervous system raises heart rate, blood pressure, and breathing to get the body ready for exercise. The sympathetic division also encourages the liver to release glucose for use as fuel.

To increase heart rate, the sympathetic nervous system (SNS) produces the catecholamines epinephrine and norepinephrine. The primary function of the parasympathetic nervous system is to calm down or lessen your body's activity. The rhyming expressions "rest and digest" or "feed and breed" are good methods to remember what your parasympathetic nervous system performs because of the messages they carry. When a person is confronted with a dangerous or terrifying scenario, one component of the autonomic nervous system, known as the sympathetic nervous system, reacts. It will automatically raise heart rate and respiration while moving blood to the muscles.

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Three-letter segments of mRNA code for specific
O sickle cells.
O disorders.
O chromosomes.
O amino acids.
First answer gets 5 stars

Answers

Each mRNA nucleotide's three letters is either a stop codon or a specific amino acid.

What do the three bases in mRNA stand for?

Three components make up mRNAs: The 3′ end controls the stability of the mRNA, the center specifies the sequence of amino acids in the polypeptide, and the 5′ end provides binding sites for proteins that start the synthesis of polypeptides.

What is the name of a trio of mRNA nucleotides?

A codon is a set of three nucleotide bases in messenger RNA that designates a certain amino acid. These codons will complement an anticodon that is linked to an amino acid.

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describes the response of auditory nerve fibers that allows for the plausibility of the theory of frequency representation:

Answers

The cochlea sends information about sound stimuli to the cochlear nucleus of the brainstem via auditory nerve fibres.

Depending on whether receptor cell population in the cochlea is contacted, the neurons that give rise to these fibres can be split into two categories.

Basically, vibrations (sound signals) are transmitted to the brain via the auditory nerve. Remember that hearing sounds is made possible by several different parts of the ear, not just the auditory nerve. A number of additional ear components are also involved.

Some sensory systems that provide information that is relevant to motor functions are distinguished by a "spatial code" in addition to a "temporal code" because they display characteristics that are tailored to specific spatial directions. Examples include otolith and semicircular canal afferents, as well as muscle spindle afferents.

Complete question:

The volley principle first proposed by Weaver & Bray (1937)

describes the response of auditory nerve fibers that allows for the plausibility of the theory of frequency representation:

a) place code

b) temporal code

c) population code

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