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Statement A: All tRNA molecules have a g...

Statement A: All tRNA molecules have a guanine residue at its ` 5' ` terminal end. Statement B: There are several tRNAs for stop codons.

A

Statement A is correct and Statement B is incorrect

B

Both the statement A and statement B are incorrect

C

Both the statement A and statement B are correct

D

Statement A is incorrect and Statement B is correct

Text Solution

AI Generated Solution

The correct Answer is:
To analyze the statements provided in the question, we will evaluate each statement separately. ### Step 1: Evaluate Statement A - **Statement A**: "All tRNA molecules have a guanine residue at its 5' terminal end." - **Analysis**: - tRNA (transfer RNA) molecules have a specific structure. At the 5' end of all tRNA molecules, there is indeed a guanine residue. This is a characteristic feature of tRNA. - Therefore, Statement A is **True**. ### Step 2: Evaluate Statement B - **Statement B**: "There are several tRNAs for stop codons." - **Analysis**: - In the genetic code, there are 64 codons, of which 61 codons code for amino acids, and 3 codons (UAA, UAG, UGA) are stop codons. - Importantly, stop codons do not have corresponding tRNA molecules. This means that there are no tRNAs that can recognize stop codons; they signal the termination of protein synthesis. - Therefore, Statement B is **False**. ### Conclusion - Statement A is true, while Statement B is false. Thus, the correct answer is that Statement A is true and Statement B is false. ### Final Answer - **Statement A**: True - **Statement B**: False
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