Which of the following statements concerning RNA synthesis is true?
A) All RNA is synthesized in the nucleolus.
B) 28S and 18S rRNA molecules are synthesized separately.
C) 2'-O-methylribose is selectively eliminated during processing of rRNA.
D) Poly A is added to mRNA during processing.

Question

Quizplus · Accepted Answer

Poly A tail is added to the mRNA during processing, which involves cleavage of the 3' end of the mRNA followed by addition of adenine nucleotides. A) is incorrect because only some types of RNA are synthesized in the nucleolus, specifically rRNA. B) is incorrect because 28S and 18S rRNA molecules are synthesized as a single precursor molecule that is then processed into separate molecules. C) is incorrect because 2'-O-methylribose is not selectively eliminated during processing of rRNA, but rather it is a modification that occurs during synthesis of certain types of RNA.

Which of the Following Statements Concerning RNA Synthesis Is True