How Might a Single Base Substitution in the Sequence of a Gene

question 50

Multiple Choice

How might a single base substitution in the sequence of a gene affect the amino acid sequence of a protein encoded by the gene?

• A) Only a single amino acid could change, because the reading frame would be unaffected.
• B) The amino acid sequence would be substantially altered, because the reading frame would change with a single base substitution.
• C) All amino acids following the substitution would be affected, because the reading frame would be shifted.
• D) It is not possible for a single base substitution to affect protein structure, because each codon is three bases long.

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