Problem:

Question 1: Occasionally the DNA may become damaged. Fortunately, several proofreading genes code for proteins that find and repair the damaged DNA. What might happen if one of these genes were damaged?

A. Tumor-suppressing genes would be turned on.

B. Oncogenes would develop into proto-oncogenes.

C. The chance of developing cancer would increase substantially

D. The cell would initiate a form of self-destruction.

Question 2: When might a frameshift or nonsense mutation not result in a completely defective protein?

A. when the mutation occurs in an exon region

B. when the mutation occurs in one of the very last codons

C. when a frameshift is balanced out by a nonsense mutation

D. when the mutation occurs in one of the first codons

Question 3: Which nucleic acid acts like an enzyme, stabilizing and orienting different moleculesto facilitate the formation of bonds between them?

A. tRNA

B. rRNA

C. mRNA

D. DNA

Please choose the correct option.