In the diagram below, which protein is needed to continue the replication of the double stranded (in blue and orange) DNA?Group of answer choicesPrimaseDNA ligaseDNA polymerase IIIDnaA
Question
In the diagram below, which protein is needed to continue the replication of the double stranded (in blue and orange) DNA?Group of answer choicesPrimaseDNA ligaseDNA polymerase IIIDnaA
Solution
The protein needed to continue the replication of the double stranded DNA is DNA polymerase III. Here's why:
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DNA replication begins at specific sites called origins of replication. The protein DnaA recognizes this origin and binds to it, but it's not involved in the continuation of replication.
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Primase is an enzyme that creates a primer on the DNA strand, which is necessary for DNA polymerase to start synthesis. However, once the primer is in place, primase is no longer needed for the continuation of replication.
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DNA polymerase III is the main enzyme that synthesizes new DNA by adding nucleotides to the primer. It is responsible for the bulk of DNA synthesis and is therefore needed to continue the replication of the double stranded DNA.
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DNA ligase is involved in the process of sealing nicks in the DNA, but it's not directly involved in the continuation of DNA replication.
So, the correct answer is DNA polymerase III.
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