Questions: A part of an mRNA has the sequence CCG. Which change to this sequence would indicate a missense mutation? A. CCU B. CGG C. CCA D. CCC

A part of an mRNA has the sequence CCG. Which change to this sequence would indicate a missense mutation?
A. CCU
B. CGG
C. CCA
D. CCC
Transcript text: A part of an mRNA has the sequence CCG. Which change to this sequence would indicate a missense mutation? A. CCU B. CGG C. CCA D. CCC
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Solution

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Solution Steps

Step 1: Identify the Original Codon and Its Amino Acid

The original mRNA sequence is CCG. Using the codon chart, we find that CCG codes for the amino acid Proline (Pro).

Step 2: Determine the Amino Acids for Each Option
  • CCU: Codes for Proline (Pro)
  • CGG: Codes for Arginine (Arg)
  • CCA: Codes for Proline (Pro)
  • CCC: Codes for Proline (Pro)
Step 3: Identify the Missense Mutation

A missense mutation results in a different amino acid. Among the options, only CGG (Arginine) codes for a different amino acid than Proline.

Final Answer

B. CGG

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