In a different mutation, a T was inserted after the fourth nucleotide on the given template strand - VCE - SSCE Biology - Question 28 - 2017 - Paper 1
Question 28
In a different mutation, a T was inserted after the fourth nucleotide on the given template strand.
The result of this mutation would be that
A. all amino acids in t... show full transcript
Worked Solution & Example Answer:In a different mutation, a T was inserted after the fourth nucleotide on the given template strand - VCE - SSCE Biology - Question 28 - 2017 - Paper 1
Step 1
A. all amino acids in this entire sequence would change.
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Answer
This statement is incorrect because a mutation that adds a nucleotide will affect the reading frame starting from the point of insertion but not all subsequent amino acids up to the end.
Step 2
B. only the first amino acid in the sequence would change.
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Answer
This statement is also incorrect as the introduction of a new nucleotide shifts the reading frame and therefore affects more than just the first amino acid.
Step 3
C. only the second amino acid in the sequence would change.
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Answer
This statement is misleading as well; the mutation will have a broader impact on the sequence than just affecting the second amino acid.
Step 4
D. all amino acids after the first in the sequence would change.
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Answer
This is the correct response. Inserting a nucleotide will change the reading frame and thus alter all subsequent amino acids after the first.
