A point mutation changes a codon from GAA to GAG, and both code for glutamic acid. What is the effect on the polypeptide?
Answer and explanation
Correct answer: C. There is no change in the amino acid sequence
- Step 1: Both codons code for the same amino acid. Step 2. This is a silent mutation. Answer: no change. Why not the others: these describe nonsense, missense and frameshift mutations.
Practise more Cells, Biological Molecules and Genes.
Free questions with an explanation for every one, and full timed Cambridge A-Level mock tests.
More Cells, Biological Molecules and Genes questions
- Which organelle is the main site of aerobic respiration in a eukaryotic cell?
- What type of bond joins amino acids together in a polypeptide?
- A competitive inhibitor reduces the rate of an enzyme-controlled reaction. Which statement explains this?
- In the fluid mosaic model of the cell surface membrane, what is the function of cholesterol?
- A cell placed in a solution has a water potential lower than the cell contents. What happens?
- Which statement about DNA replication is correct?