Question

4. Which form of DNA is possible as well as the linear form?

a. circular

b. stem loop

c. A-DNA

d. supercoiled

e. B-DNA

5. Why might a single base-pair mutation in eukaryotic mRNA be less serious than one in prokaryotic mRNA?

a. If the mutation occurs in the exon, it will not affect the gene product.

b. If the mutation occurs in the 3′ end of the start site, it will not affect the gene product.

c. If the mutation occurs in the intron or not in the splice site of a transcript with alternative splicing, it will not affect the gene product.

d. If the mutation occurs in the splice site of a transcript with alternative splicing, only one gene product may be affected.

e. If the mutation occurs in the 5′ end of the start site, it will not affect the gene product.

6. The step-by-step addition of deoxyribonucleotides to a DNA strand is catalyzed by:

a. polymerases.

b. topoisomerases.

c. helicase.

d. gyrase.

. endonuclease.

Answer 1

4. "(d) supercoiled form" of DNA is possible as well as linear form.

5. (c) If the mutation occurs in the intron or not in the splice site of a transcript with alternating splicing, it will not affect the gene product, that's why a single base-pair mutation in eukaryotic mRNA be less serious than one in prokaryotic mRNA.

6. The step-by-step addition of deoxyribonucleotides to a DNA strand is catalyzed by "(a) polymerases".