Gene mutations Quiz
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5 questions, one answer each
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1. Which type of mutation replaces one base with another?
- A. Deletion
- B. Substitution
- C. Insertion
- D. Duplication
2. Which mutation is most likely to change every amino acid after the mutation?
- A. Substitution of the third base of a codon
- B. Deletion of three consecutive bases
- C. Substitution that creates a stop codon
- D. Insertion of one base
3. Why might a substitution have no effect on the polypeptide?
- A. The new codon may code for the same amino acid because the code is degenerate
- B. Substitutions are always repaired
- C. Substitutions only happen in RNA
- D. The ribosome ignores the changed base
4. An insertion of one base near the start of a gene most likely causes which of the following?
- A. No change in the polypeptide
- B. A change in one amino acid only
- C. A shift in the reading frame that alters all later codons
- D. The replacement of one base by another
5. A substitution changes the codon GAA to UAA, a stop codon. What is the effect?
- A. The same amino acid is added
- B. The polypeptide is shortened
- C. A different amino acid is added
- D. The polypeptide is longer