23.
Which statement best describes the main distinction between the origin of the two classes of small regulatory RNAs: siRNA and miRNA ?
A:
siRNAs originate within the cell cytoplasm; miRNAs originate from the cell genome
B:
siRNAs originate from predominantly exogenous dsRNA; miRNAs originate from the cell genome
C:
miRNAs are expressed whenever siRNAs are unable to appropriately degrade RNA sequences
D:
miRNAs are processed from dsRNA viruses, siRNAs are processed from ssRNA viruses
The answer is:
B
