What is the function of primers in PCR?
Answer and explanation
Correct answer: B. They give DNA polymerase a starting point
- Step 1: Primers are short single strands complementary to the ends of the target DNA.
- Step 2: Polymerase can only start replication from a primer.
Answer
They give DNA polymerase a starting point.
Why not the others: They separate the strands of DNA: heating does this. They join the DNA fragments together: this is ligase. They supply nucleotides: free nucleotides are added separately.
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