A cDNA library differs from a genomic library in which way?
A) It consists solely of RNA molecules.
B) It contains many copies of the gene of interest.
C) It contains only coding sequences, not introns.
D) It is typically 10-100 times the size of a DNA library.

Question

Quizplus · Accepted Answer

A cDNA library is made from DNA copies of RNA molecules, and therefore only contains coding sequences, not introns. A genomic library, on the other hand, is made from genomic DNA and contains both coding and non-coding sequences. Therefore, choice C is the correct answer. Choices A, B, and D are incorrect because a cDNA library can contain many copies of the gene of interest, it is made from RNA molecules that are converted to DNA, not solely RNA molecules, and the size of a cDNA library can vary and is not necessarily larger than a genomic library.

A CDNA Library Differs from a Genomic Library in Which