If a researcher is interested in cloning only the protein coding parts of a gene, not the introns or promoter, what should the researcher do?

A.Use DNA polymerase to transcribe the gene.

B.Use a restriction enzyme to cut the gene into shorter pieces.

C.Use reverse transcriptase to reconstruct a cDNA from the gene’s mRNA.

D.Use DNA ligase to join together only fragments of the DNA that code for the protein.

正确答案：Use reverse transcriptase to reconstruct a cDNA from the gene’s mRNA.