3
lesson pretestMultiple Choice

Pretest

Question 3 • CMS 2026-2027 Biology CREDIT RECOVERY

Which best describes the process of making recombinant DNA?

Answer
A
The sticky ends of fragmented DNA are joined with vector DNA.
B
The isolated genes are placed into a vector.
C
The isolated DNA is inserted into a mechanical vector for cloning.
D
The isolated genes are joined by using restriction enzymes.

Explanation

Restriction enzymes cut the DNA fragment and the vector, often leaving matching sticky ends. Those ends pair up, and DNA ligase seals them together to form recombinant DNA. This is best described by “the sticky ends of fragmented DNA are joined with vector DNA.”

AI-written and checked against the verified answer.

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