Question:
The 5' cap of eukaryotic mRNAs contains
The 5' cap of eukaryotic mRNAs contains
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Remember: The 5' cap is essential for mRNA stability and translation initiation.
Updated On: Sep 8, 2025
- a modified guanine nucleotide
- a modified adenine nucleotide
- a modified cytosine nucleotide
- a modified uracil nucleotide
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The Correct Option is A
Solution and Explanation
Step 1: Recall the function of the 5' cap.
- The 5' cap is a modified guanine nucleotide added to the 5' end of eukaryotic mRNAs. - It protects the mRNA from degradation and assists in ribosome binding during translation.
Step 2: Analyze the options.
- (A) Correct: The 5' cap is composed of a modified guanine nucleotide (7-methylguanosine).
- (B) Incorrect: The 5' cap does not contain adenine.
- (C) Incorrect: The 5' cap does not contain cytosine.
- (D) Incorrect: The 5' cap does not contain uracil.
Step 3: Conclusion.
The 5' cap contains a modified guanine nucleotide. Final Answer: \[ \boxed{\text{The 5' cap contains a modified guanine nucleotide.}} \]
- The 5' cap is a modified guanine nucleotide added to the 5' end of eukaryotic mRNAs. - It protects the mRNA from degradation and assists in ribosome binding during translation.
Step 2: Analyze the options.
- (A) Correct: The 5' cap is composed of a modified guanine nucleotide (7-methylguanosine).
- (B) Incorrect: The 5' cap does not contain adenine.
- (C) Incorrect: The 5' cap does not contain cytosine.
- (D) Incorrect: The 5' cap does not contain uracil.
Step 3: Conclusion.
The 5' cap contains a modified guanine nucleotide. Final Answer: \[ \boxed{\text{The 5' cap contains a modified guanine nucleotide.}} \]
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