From the following, Identify the statements that are correct regarding tRNA.
I. Hydrogen bonds between bases temporarily hold tRNA against mRNA.
II. The base sequences in the tRNA molecules are the same as the base sequences in the mRNA that is being translated.
III. The specificity of the tRNA moleucle for glycine and the specificity of the enzyme that loads glycine are both necessary for correct loading.

Options

A. I, II and III
B. I and II only
C. I and III only
D. II and III only

Answer

To solve the question regarding the correctness of the statements about tRNA, we will analyze each statement step by step.

### Step 1: Analyze Statement I
**Statement I:** Hydrogen bonds between bases temporarily hold tRNA against mRNA.

- **Explanation:** This statement is correct. During translation, tRNA pairs with mRNA through complementary base pairing, which is facilitated by hydrogen bonds. These bonds are temporary and allow the tRNA to bring the appropriate amino acid to the ribosome.

### Step 2: Analyze Statement II
**Statement II:** The base sequences in the tRNA molecules are the same as the base sequences in the mRNA that is being translated.

- **Explanation:** This statement is incorrect. The tRNA contains anticodons, which are complementary to the codons in the mRNA. Therefore, the base sequences are not the same; they are complementary.

### Step 3: Analyze Statement III
**Statement III:** The specificity of the tRNA molecule for glycine and the specificity of the enzyme that loads glycine are both necessary for correct loading.

- **Explanation:** This statement is correct. Each tRNA molecule is specific to a particular amino acid (in this case, glycine), and the enzyme (aminoacyl-tRNA synthetase) that attaches the amino acid to the tRNA must also be specific. This ensures that the correct amino acid is loaded onto the appropriate tRNA.

### Conclusion
After analyzing all three statements:
- **Correct Statements:** I and III
- **Incorrect Statement:** II

### Final Answer
The correct option is that statements I and III are correct.

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