Question

What enzyme is responsible for proofreading to check for mutations after replication?

1) DNA helicase
2) DNA polymerase
3) RNA polymerase
4) RNA helicase

Answer 1

DNA polymerase is responsible for proofreading and checking for mutations after replication.

Step-by-step explanation:

The enzyme responsible for proofreading to check for mutations after replication is DNA polymerase.

DNA polymerase has proofreading ability which allows it to read the newly added base before adding the next one. This helps to ensure that the newly added base has paired correctly with the base in the template strand. If an incorrect base has been added, the enzyme makes a cut at the phosphodiester bond and releases the wrong nucleotide. After the incorrect nucleotide is removed, a new one can be added. This process helps to minimize the number of mutations that persist.