[13] Mastering Biology

Question 1

A? B? C? D? E? F? G? H?

Answer 1

Question 2

In DNA replication in bacteria, the enzyme DNA polymerase III (abbreviated DNA pol III) adds nucleotides to a template strand of DNA. But DNA pol III cannot start a new strand from scratch. Instead, a primer must pair with the template strand, and DNA pol III then adds nucleotides to the primer, complementary to the template strand. Each of the four images below shows a strand of template DNA (dark blue) with an RNA primer (red) to which DNA pol III will add nucleotides.

In which image will adenine (A) be the next nucleotide to be added to the primer?

Answer 2

C

Question 3

Answer 3

Question 4

Answer 4

Question 5

Answer 5

Question 6

The diagram below shows a replication bubble with synthesis of the leading and lagging strands on both sides of the bubble. The parental DNA is shown in dark blue, the newly synthesized DNA is light blue, and the RNA primers associated with each strand are red. The origin of replication is indicated by the black dots on the parental strands.

Rank the primers in the order they were produced. If two primers were produced at the same time, overlap them.

Answer 6

A & H, then B & G, then C & F, then D & E