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Papessa [141]
2 years ago
9

What stimulates cell division?

Biology
2 answers:
algol [13]2 years ago
8 0
C I think I'm not 100% sure
aleksley [76]2 years ago
8 0
<h3><u>Answer;</u></h3>

A.) Stimuli and regulating protein agents stimulate cell division.

<h3>Explanation;</h3>
  • <em><u>Cell division is the process that occurs in organisms where a individual cell divides into two or more daughter cells. </u></em>
  • <em><u>There are two major types of cell division, mitosis that takes place in the somatic cells and meiosis that takes place in the germ line cells.Cell division is regulated  by both external factors and internal factors. </u></em>
  • External factors include physical and chemical signals from metabolic pathways. <em><u>Stimulation of cell division is by proteins called growth factors, which are most important in embryonic development and cell repair and wound healing.</u></em>
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6 0
3 years ago
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What process is described here? A concentration gradient of H + ions is created in the periplasmic space by actively transportin
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<h3>Oxidative Phosphorylation</h3>

Explanation:

The process by which ATP is generated by utilizing the large amount of energy released during the transfer of electrons from NADH or FADH₂ to the O₂  through a series of electron carrier present in the mitochondrial membrane is called oxidative phosphorylation.

The process of electron transfer is accompanied by the pumping of protons across inner membrane of mitochondria, from the  mitochondrial matrix to intermembrane space establishing electrochemical proton gradient.

The ATP synthase complex present in the mitochondrial membrane allows the protons to move down the proton gradient  as a result enough energy is released to add a phosphate group to ADP and form ATP inside the mitochondrial matrix.

8 0
3 years ago
Which air pressure reading would be most likely during a clear, sunny day?
Effectus [21]

the answer is option D.

7 0
3 years ago
Which food contains the material needed to build muscle , but does not contain the macromolecules that give quick energy
Alecsey [184]

Answer:

Protein containing food like meat, egg and chicken etc is the muscle building food.

Explanation: Protein containing food such as meat is the food substance that contains the nutritive materials which helps in the build of muscles in the human body , but does not contain the macromolecules that provides quick energy. Meat which is a good source of protein and we know that protein is the main nutrient which is responsible for the building of muscles in the human body.

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3 years ago
A gene is involved in promoting limb development in humans. The gene is initially weakly activated during the limb induction pha
Anna [14]

Answer:

1. If the gene is weakly activated, it likely lacks repressive histone modifications, but may also lack the presence of histone marks associated with strong transcriptional activation such as acetylation.

When the gene is strongly activated, it likely lacks repressive marks (such as H3K9me2/3 and H3K27me3 - both examples of repressive histone methylation) and might possess some activating histone acetylation marks, such as H3K4ac, and active histone methylation such as H3K4me3

<em>An aside: The pattern and presence of different histone modifications would depend on the gene, but based on the fact that it is a developmental gene, I would assume that H3K27me3 and H3K4me3 are at play (these are part of the Polycomb/Trithorax system)</em>

<em />

After limb growth is complete, the gene is turned off. Repressive histone methylation marks would be associated with this state, such as the aforementioned H3K9me2/3 or H3K27me3.

2. Histone modifications are tightly linked to genome organisation. Histone methylation marks associated with repression such as H3K27me3 and H3K9me3 are associated with compact chromatin structures, which restrict the access of transcriptional machinery and other positive regulators. Conversely, histone marks associated with gene activation are associated with a more permissive chromatin environment that facilitates the binding of factors associated with gene expression. In the case of histone acetylation, the acetyl mark directly removes the positive charge of chromatin, relaxing its interaction with negatively charged DNA.

3. If the inappropriate activation of this gene caused a cancerous tumor, this gene would be referred to as an oncogene (or a proto-oncogene for the term before it is inappropriately activated).

Typically, there are two classes of genes that lead to cancer: tumor-suppressor genes and oncogenes. Tumor suppressor genes lead to cancer when their protective activity is reduced or demolished, leading to the production of cancer cells. Oncogenes lead to cancer when they become over active. Oncogenes are often genes associated positively with growth and proliferation, consistent with the gene in this example.

8 0
3 years ago
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