CDNA ____

Question

cDNA ____.  
A) does not contain exons
B) is produced from tRNA
C) production utilizes reverse transcriptase
D) begins as a hybrid between two mRNA molecules
E) is present only in bacteria

Accepted Answer

cDNA stands for complementary DNA, which is produced from RNA using reverse transcriptase, an enzyme that synthesizes DNA from an RNA template. This cDNA can then be used for further analysis such as cloning or gene expression studies. Choice A is incorrect because cDNA can contain exons depending on the method used to generate it. Choice B is incorrect because cDNA is produced from mRNA, not tRNA. Choice D is incorrect because cDNA is produced from a single mRNA molecule, not a hybrid between two mRNA molecules. Choice E is incorrect because cDNA is present in all organisms that use RNA as their genetic material, including bacteria.