Question

5-aug ucu ccu caa
based on this mutation, which of the following statements are correct?
correct answer(s)
drag appropriate answer(s) here
nearly all changes to a nucleotide sequence will lead to a significant adverse impact on the amino acid sequence.
if the u is mutated to c, the mrna will still encode for the amino acid proline.
if the u is mutated to c, the mrna will now encode for a stop codon.
due to redundancy in the genetic code, a change in the third nucleotide of a codon often leads to no change in the amino acid sequence.

Explanation:

• First statement: Not all nucleotide changes lead to significant adverse impacts. Many are silent due to genetic code redundancy.
• Second statement: The codon \( CCU \) (original) and \( CCC \) (if \( U \) mutates to \( C \)) both code for proline.
• Third statement: The original codon \( CCU \) codes for proline, not a stop codon.
• Fourth statement: The genetic code is redundant, so third - nucleotide changes often don't alter the amino acid.

Answer:

If the \( U \) is mutated to \( C \), the mRNA will still encode for the amino acid proline. Due to redundancy in the genetic code, a change in the third nucleotide of a codon often leads to no change in the amino acid sequence.