The DNA duplex consists of two long covalent polymers wrapped around each other many times over their entire length. The separation of the DNA strands for replication causes the strands to be "overwound" in front of the replication fork

How does the cell relieve the torsional stress created along the DNA duplex during replication?
(a) Nothing needs to be done because the two strands will be separated after replication is complete.
(b) Topoisomerases break the covalent bonds of the backbone allowing the local unwinding of DNA ahead of the replication fork.
(c) Helicase unwinds the DNA and rewinds it after replication is complete.
(d) DNA repair enzymes remove torsional stress as they replace incorrectly paired bases.


(b)

Biology & Microbiology

You might also like to view...

Among the fungi, which feature is uniquely present in the chydrids?

A. Flagella B. Cell wall composed of mannans C. Pellicle D. Polysaccharide capsule

Biology & Microbiology

Bacterial endospores usually function in

A. reproduction B. survival C. protein synthesis D. storage

Biology & Microbiology

A carrier molecule is required for 

A. osmosis and active transport. B. active transport and facilitated diffusion. C. osmosis and diffusion. D. facilitated diffusion and endocytosis.

Biology & Microbiology

What are coadapted gene complexes?

a. genes that are located on the same chromosome b. codominant alleles c. favorable combinations of alleles at different loci d. any epistatic interaction between different loci e. A and C

Biology & Microbiology