Question

As DNA replication continues and the replication bubble expands, the parental double helix is unwound and separated into its two component strands. This unwinding and separating of the DNA requires three different types of proteins: helicase, topoisomerase, and single-strand binding proteins. Sort the phrases into the appropriate bins depending on which protein they describe.

(1) binds at the replication fork
(2) binds after the repication fork
(3) binds ahead of the replication fork
(4) binds H-bond between bases
(5) prevent H-bond between bases
(6) breaks covalent backbond in DNA backbone

(A) Helicase
(B) Topoisomerase
(C) Single strand binding protein

Answer 1

Helicases

(1) binds at the replication fork

(4) breaks H-bond between bases

Topoisomerase

(3) binds ahead of the replication fork

(6) breaks covalent backbond in DNA backbone

Single-strand binding

(2) binds after the repication fork

(5) prevent H-bond between bases

Step-by-step explanation:

Helicases can be described as a class of proteins that separate the two strands of the double helix by breaking the hydrogen bonds present between them.

The DNA is coiled so that it can fit into an organism. Topoisomerases are proteins that are involved in unwinding the DNA from the site of replication.

Single-stranded proteins are proteins that prevent the reformation of hydrogen bonds in the DNA helix at the site of transcription.