Acertain regulatory gene is involved in controlling the expression of other genes. in studying this regulatory gene, a scientist discovers that it encodes for an enzyme that causes histone deacetylase (the removal of acetyl groups from histone tails). based on this information, how would you predict that this enzyme regulates gene expression? a. it causes tighter packing of the chromatin at the target gene to inhibit translation. b. it causes decompression of the chromatin at the target gene to inhibit translation. c. it activates gene promoters to signal for the biding of rna polymerase. d. it activates rna processing by removing introns and splicing exons together.

The correct answer is A it causes tighter packing of the chromatin at the target gene to inhibit translation.

Explanation:

Histone deacetylase is one of the most significant enzyme of chromatin remodeling.Histon  deacetylase carry out the opposite function of histone acetyl transferase that is to remove the acetyl group from the epsilon -NH2 group of amino acid lysine.

  The removal of acetyl group result in the compaction of the chromatin at the the target gene to inhibit translation.

answer: - b cells

explanation: -

so, the b cells mediate their action by identifying the antigens present on the surface of the pathogens and then producing antibodies in return to mediate its effect.