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2.3.2 Test (CST): Genes and Traits
Question 7 of 25
Which sentence describes a substitution mutation?
A. One or more nucleotides are removed from a sequence.
B. A nucleotide is replaced with another nucleotide.
C. A nucleotide is shared during bacterial conjugation.
D. One or more nucleotides are added to a sequence.

Verified Answer :

GinnyAnswer

I'd be happy to help you with that question! Here's a clear and concise answer to your question:

A substitution mutation is when a nucleotide is replaced with another nucleotide. This means that one base in the DNA sequence is swapped out for a different base.

For example, let's consider the following DNA sequence:
Original: A T C G A
After substitution mutation: A T G G A

In this case, the third nucleotide (C) was replaced with a different nucleotide (G) resulting in a change in the DNA sequence due to a substitution mutation.

Therefore, the correct answer to the question "Which sentence describes a substitution mutation?" is:

B. A nucleotide is replaced with another nucleotide.

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