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Flura [38]
3 years ago
11

Why do mitochondria and chloroplasts have relatively small genomes?

Biology
1 answer:
Komok [63]3 years ago
6 0

Answer:

B) Over time, much of their nucleic acid has migrated to the host cell nucleus

Explanation:

The origin of chloroplasts and mitochondria is explained via endosymbiosis theory: they  originated as prokarytoic symbionts. The host cell acquired genetic information from them and “took it up” by lateral gene transfer. Those genes (now located in the eukaryotic cell nucleus-nuclear genome) encode the great majority of chloroplast and mitochondrial proteins, as well as many proteins of the nucleus and cytosol.  

Yet ,chloroplasts and mitochondria retained some of the genes in their genomes.

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The sponge-like structure, as well as the high salt content of water and the <span>ease of contaminating water contribute to the environmental stress on a coral reef.

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6 0
3 years ago
Read 2 more answers
As part of maintaining homeostasis, why are hormones, secreted by endocrine cells, continuously inactivated?
IceJOKER [234]

Answer:

Homeostasis refer to as the maintainence of equillibrium within the body. Endocrine systems play a major role in maintainence of equillibrium. The hormones released are continuously inactivated by negative feeback system to maintain homeostsis.

Explanation:

Homeostasis in a body is refered as a dynamic equillibrium which constantly changes. Feedback regulation systems maintain homeosatsis.

The release of hormones into the blood is controlled by a stimulus. A stimulus can increase or decrease the release of hormones.The response to a stimulus changes the internal conditions and may itself become a new stimulus. This self-adjusting mechanism is called feedback regulation.

There are two types of feedback systems.

Negative feedback occurs when the response to a stimulus reduces the original stimulus. Positive feedback occurs when the response to a stimulus increases the original stimulus.

If the hormones released are not controlled by these feedback systems, enormous amount of hormones will change the whole internal enviornment of the body ,hence, equillibrium will be disturbed and result in death of cells and death of an indivisual.

8 0
3 years ago
The theory of __________ proposed that a series of catastrophes or mass extinctions followed by repopulation could explain why s
Roman55 [17]
The theory of evolution proposed that a series of catastrophes or mass extinctions followed by repopulation could explain why species change over time
6 0
3 years ago
Please help
Anettt [7]

Answer:

Heat

Explanation:

In almost all the energy conversion process some of energy is lost in the form of heat.

3 0
3 years ago
Over the past four decades, researchers have identified many types of ______. Examples include growth factor receptors, transcri
Serhud [2]

Over the past four decades, researchers have identified many types of oncogenes, including growth factor receptors, transcription factors, and intracellular signaling proteins.

<h3>What are oncogenes?</h3>

These are specific genes in an organism that can cause the formation of cancer. These genes are prone to defects that when activate, signal for a cell to become a tumor. The genes listed in the question are some examples of the types of cells that can be oncogenes.

Therefore, we can confirm that over the past four decades, researchers have identified many types of oncogenes, including growth factor receptors, transcription factors, and intracellular signaling proteins.

To learn more about oncogenes visit:

brainly.com/question/7310602?referrer=searchResults

6 0
2 years ago
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