Question

The following question has two parts. First, answer Part A. Then, answer Part B.

Part A:
original dna strand c t g g a g

mutated dna strand c t a g
When did the mutation most likely occur?

A.
before transcription

B.
during transcription

C.
during translation

D.
after translation

Multiple Choice Question
Part B:

Which best supports the choice from Part A?

A.
Deletion mutations occur during DNA replication, changing how DNA is transcribed.

B.
Deletion mutations occur after DNA replication, changing how mRNA is translated.

C.
Deletion mutations occur during protein synthesis, changing the order of polypeptides.

D.
Deletion mutations occur after protein synthesis, changing the proteins that are formed

Answer 1

Part A: A (before transcription)

Part B: A — Deletion mutations are changes to the DNA sequence that arise during DNA replication, so the altered DNA is what gets transcribed into mRNA and then translated into altered protein.