Question

Choose the CORRECT statement

1. In prokaryotes there is a single replication bubble.
2. In prokaryotes there are two replication bubbles
3. In prokaryotes there are two replication forks in a replication bubble
4. In eukaryotes there are two replication bubbles and two replication forks
5. In eukaryote there are several replication bubbles.

• A. ii, iii
• B. i, iii, v
• C. All
• D. ii, iv

Answer 1

Answer:

B. i, iii, v

Prokaryotes are single-celled organisms that lack a nucleus, and all prokaryotes have circular DNA that replicates from a single origin. This results in a single replication bubble. In prokaryotes, DNA replication begins at the single origin of replication on the circular chromosome. The replication forks then move in opposite directions, replicating the DNA around the entire circle of the chromosome. This process results in two DNA molecules. Eukaryotic DNA is linear and has many origins of replication, which initiate replication almost simultaneously. Each origin of replication forms a replication bubble, which is a bulge in the DNA where replication is occurring.