The section of DNA shown in Question 12 came into contact with a mutagen, resulting in a change in the cytosine - HSC - SSCE Biology - Question 13 - 2022 - Paper 1
Question 13
The section of DNA shown in Question 12 came into contact with a mutagen, resulting in a change in the cytosine. The effect on the DNA after several replication cycl... show full transcript
Worked Solution & Example Answer:The section of DNA shown in Question 12 came into contact with a mutagen, resulting in a change in the cytosine - HSC - SSCE Biology - Question 13 - 2022 - Paper 1
Step 1
A. a frame-shift mutation.
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Answer
A frame-shift mutation occurs due to the insertion or deletion of nucleotide bases, which shifts the reading frame of the genetic code. This option does not directly describe the change in cytosine.
Step 2
B. an increase in cytosine.
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Answer
While cytosine levels may be altered, the question implies a mutation rather than a mere increase in a nucleotide type.
Step 3
C. a change in one base pair.
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The scenario suggests that the change involves altering a base. A mutation typically impacts base pairing directly, indicating this option is plausible.
Step 4
D. a change in one nucleotide.
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Answer
Since the question centers around a change in cytosine, this choice accurately reflects the specific change occurring in the DNA due to the mutagen. A change in one nucleotide encompasses the essence of a mutation at a single site.
