Vertebrate cells possess a protein that binds to clusters of 5-methylcytosine and ensures the gene will stay in the off position. this control of gene regulation is a result of

Methylation

Explanation:

The gene regulation is the important phenomena for the proper physical expression and metabolic function of the body. The gene may gets activate or inactivate depending upon the type of modification.

The acetylation modification increases the expression of gene. The methylation modification is done by the enzyme methyl transferase. The metylation at specific lysine residues result in the decrease or off gene expression.

Thus, the answer is methylation.

i would go with b

cytokinesis occurs after telophase so that eliminates d

and the entire reason for cytokinesis is for cellular reproduction

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.