?

AP® Biology

Free Version

Upgrade subject to access all content

Moderate

PCR Technique

APBIO-YSN0Y3

PCR is a technique used to amplify a certain segment of DNA, potentially creating millions of copies.

Which of the following describes a key step in performing PCR?

A

Heat shock at 42 Celsius for 90 seconds.

B

Addition of $CaCl_2$ to make the cell’s DNA.

C

Addition of Taq polymerase to replicate the DNA.

D

Adding RNA primers to flank the ends of the DNA that are targeted for copying.