Which one of the following statements is true for protein synthesis `(` translation `)` ?

Options

A. amino acids are directly recognized by m-RNA
B. the third base of the codon is less specific
C. only one codon codes for an amino aicd
D. every t-RNA molecule has more than one amino acid attachment.

Explanation

To solve the question regarding which statement is true for protein synthesis (translation), let's analyze each option step by step.

### Step 1: Analyze Option A
**Statement:** Amino acids are directly recognized by mRNA.
**Evaluation:** This statement is false because amino acids are not directly recognized by mRNA. Instead, they are recognized by transfer RNA (tRNA) molecules, which have anticodons that pair with the codons on the mRNA.

**Hint:** Remember that tRNA plays a crucial role in bringing the correct amino acids to the ribosome during translation.

### Step 2: Analyze Option B
**Statement:** The third base of the codon is less specific.
**Evaluation:** This statement is true. The genetic code is degenerate, meaning that multiple codons can code for the same amino acid. The first two bases of a codon are usually more specific, while the third base can vary without changing the amino acid that is produced.

**Hint:** Consider how the redundancy in the genetic code allows for variations in the third base of codons.

### Step 3: Analyze Option C
**Statement:** Only one codon codes for an amino acid.
**Evaluation:** This statement is false. Many amino acids are encoded by more than one codon. For example, leucine is coded by six different codons.

**Hint:** Recall that the genetic code is made up of 64 codons, but there are only 20 amino acids, leading to multiple codons coding for the same amino acid.

### Step 4: Analyze Option D
**Statement:** Every tRNA molecule has more than one amino acid attachment.
**Evaluation:** This statement is false. Each tRNA molecule is specific to one amino acid and carries only that particular amino acid to the ribosome during translation.

**Hint:** Think about the specificity of tRNA molecules and their role in ensuring the correct amino acid is added to the growing polypeptide chain.

### Conclusion
After analyzing all the options, we find that **Option B** is the only true statement regarding protein synthesis (translation).

### Final Answer
**The correct statement is:** The third base of the codon is less specific.