Question

At which end are the new DNA bases added?

(a) 5’ triphosphate end

(b) 3’ triphosphate end

(c) 5’ OH end

(d) 3’ OH end

This question was addressed to me in homework.

The origin of the question is DNA Replication Prokaryotes topic in chapter DNA Replication of Cytogenetics

Answer 1

Correct option is (d) 3’ OH end

Easy explanation: DNA replication proceeds from 5’ -> 3’ direction with new bases being added to 3’-OH end. 5’-P is at the beginning of DNA Strand.