Which statement is correct?
A) DNA polymerase unwinds the DNA at replication forks.
B) Primase removes short RNA primers and replaces them with DNA.
C) Ligase breaks the hydrogen bonds between complementary DNA strands.
D) DNA polymerase proofreads DNA, correcting mismatched nucleotides.
E) Replication forks form as the sugar phosphate backbone is sealed.

Question

Quizplus · Accepted Answer

DNA polymerase is responsible for adding nucleotides during DNA replication, but it also has proofreading activity. It can detect and correct mismatched nucleotides, increasing the accuracy of DNA replication.

Note: All the other statements in the question are incorrect. DNA helicase is responsible for unwinding the DNA at replication forks; primase adds short RNA primers that are later replaced by DNA; ligase seals breaks in the sugar-phosphate backbone; and replication forks form as the DNA strands are separated.

Which Statement Is Correct