MCAT Biochemistry Question 82: Answer and Explanation
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Question: 82
7. How is cDNA best characterized?
- A. cDNA results from a DNA transcript with noncoding regions removed.
- B. cDNA results from the reverse transcription of processed mRNA.
- C. cDNA is the abbreviation for deoxycytosine.
- D. cDNA is the circular DNA molecule that forms the bacterial genome.
Correct Answer: B
Explanation:
cDNA (complementary DNA) is formed from a processed mRNA strand by reverse transcription. cDNA is used in DNA libraries and contains only the exons of genes that are transcriptionally active in the sample tissue.