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torisob [31]
3 years ago
8

What are some factors that might cause a cell to be unable to regulate its cell cycle​

Biology
1 answer:
jenyasd209 [6]3 years ago
5 0

Answer:

Some of the factors that might cause unregulated cell cycle are-

  1. Genetic mutation
  2. Growth factors
  3. inactivation of tumor suppressor gene
  4. Disregulation of cell cycle check points
  5. Oncogenic retroviruses.

Explanation:

1. Genetic Mutation- mutation in the proto-oncogenes can turn them into oncogenes which stimulate cell division. Some common causes of genetic mutation are radiations, chemical agents called mutagens, etc.

2. Growth factors- these are the molecules that bind to receptor proteins to initiate a signaling pathway that can result in cell cycle.

3. Tumor suppressor genes- these are the genes responsible for stopping the cell to enter cell cycle. Inactivation of these genes can cause unregulated cell division.

4. Cell cycle checkpoints - during the cell cycle, a cell has to pass through certain checkpoints which make sure the continuity or stopping of the process. Problem in their regulation can cause uncontrolled cell division.

5. retroviruses- These are the viruses who have RNA as their genetic material instead of DNA. They replicate via DNA intermediate which when they insert inside a cell can start cell cycle.

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experimental evidence shows that the process of glycolysis is present and virtually identical in organisms from all three domain
puteri [66]

The question is incomplete as it lacks the multiple options. The multiple options are as follows:

a. Across the three domains, all organisms depend solely on the process of anaerobic respiration for ATP production .

b. Glycolysis is a universal energy-releasing process and therefore suggests a common ancestor for all forms of life .

c. The existence of glycolysis as an energy-releasing process in all organisms suggests that convergent evolution occurred .

d. All organisms carry out glycolysis in mitochondria.

Answer:

Option (b).

Explanation:

The three main domains of life are prokarya, eukarya and archaea. The archaea and eukarya are more closely related with each other than the prokarya.

The glycolysis is the process of breakdown of glucose molecule to generate ATP. The glycolysis is the most common process of the generation of the ATP are present in almost all the organisms whether the organisms is ancestral or modern.  

Thus, the correct answer is option (b).

4 0
3 years ago
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lubasha [3.4K]

Answer:

Monosaccharide are called as simple sugar because it consists of one sugar unit that can not be further broken down into the simpler form.

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The answer is <span>D) The atmosphere has no significant role in the phosphorus cycle, but is an essential part of the sulfur cycle.

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