The cDNA libraries can be prepared by isolating

A. tRNA

B. mRNA

C. DNA

D. rDNA

Answer: Option B

Solution(By Examveda Team)

The cDNA libraries can be prepared by isolating mRNA.
The creation of a cDNA library starts with mRNA instead of DNA. Messenger RNA carries encoded information from DNA to ribosomes for translation into protein.
To create a cDNA library, these mRNA molecules are treated with the enzyme reverse transcriptase, which is used to make a DNA copy of an mRNA.