Question

as an embryo develops, identical cells give rise to specialized cells that perform different functions. what statement best describes the role of rna in the differentiation of a specialized cell? a. all genes in the cell are transcribed into rna molecules, but only some of these molecules are translated into proteins. b. rna deletes regions of the dna that are unnecessary to the cell, and then it uses the remaining dna to make proteins. c. rna synthesizes new genes, and then it transcribes and translates these new genes into proteins specific to the cell. d. certain genes in the cell are transcribed into rna molecules, which are then translated into proteins specific to the cell.

Explanation:

During cell differentiation, not all genes are expressed. Only specific genes are transcribed into RNA, which are then translated into proteins that give the cell its specialized function. Option A is incorrect as not all genes are transcribed. RNA does not delete DNA regions (Option B is wrong), and RNA does not synthesize new genes (Option C is wrong).

Answer:

D. Certain genes in the cell are transcribed into RNA molecules, which are then translated into proteins specific to the cell.