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In a mutation, the eighth nucleotide in this sequence was changed from C to T - VCE - SSCE Biology - Question 27 - 2017 - Paper 1
Question 27
In a mutation, the eighth nucleotide in this sequence was changed from C to T. What would be the result of this mutation? A. The peptide chain would be shortened. B.... show full transcript
Worked Solution & Example Answer:In a mutation, the eighth nucleotide in this sequence was changed from C to T - VCE - SSCE Biology - Question 27 - 2017 - Paper 1
Step 1
A. The peptide chain would be shortened.
Answer
This option implies that the mutation introduced a stop codon in the translation process, causing a premature termination of the peptide chain. However, a change from C to T at this position does not necessarily result in a stop codon, and thus, this option is not correct.
Step 2
B. The third amino acid would change from Thr to Ile.
Answer
To determine if this mutation changes the amino acid sequence, we need to identify the codon corresponding to the third amino acid based on the original and mutated nucleotide sequence. This option is also likely incorrect unless the specific pattern of nucleotides is known.
Step 3
Step 4
D. There would be no change in the amino acid sequence.
Answer
This is a potential result if the specific change from C to T does not alter the codon that codes for the amino acids due to redundancy in the genetic code. If the codon for the eighth nucleotide results in the same amino acid or is silent, then this option would be correct.