試題詳解

23. Using RNA as a template for protein synthesis instead of translating proteins directly from the DNA is advantageous for the cell because
(A) RNA is much more stable than DNA.
(B) RNA acts as an expendable copy of the genetic material.
(C) only one mRNA molecule can be transcribed from a single gene, lowering the potential rate of gene expression.
(D) tRNA, rRNA and others are not transcribed.
(E) mRNA molecules are subject to mutation but DNA is not.