Consider the following statements and choose the correct option :-
(a) Six codons do not code for any amino-acid.
(b) Codon is read in m-RNA in a contiguous fashion.
(c) Three codons function as stop codons.
(d) In eukaryotes the initiator codon AUG codes for methionine.

Options

A. (a), (b) and (d) are wrong
B. (a), (b) and (c) are wrong
C. (b), (c) and (d) are wrong
D. (a) is wrong

Answer

To solve the question, we need to evaluate each of the four statements regarding codons and their functions in protein synthesis. Let's break down each statement step by step.

### Step-by-Step Solution:

1. **Statement (a): Six codons do not code for any amino acid.**
- This statement is incorrect. There are three codons that do not code for any amino acid; these are known as stop codons (UAA, UAG, UGA). Therefore, the claim that six codons do not code for any amino acid is false.

2. **Statement (b): Codon is read in m-RNA in a contiguous fashion.**
- This statement is correct. Codons are read in a continuous sequence without any gaps, meaning that the ribosome reads the mRNA in sets of three nucleotides (codons) to synthesize proteins.

3. **Statement (c): Three codons function as stop codons.**
- This statement is correct. The three stop codons (UAA, UAG, UGA) signal the termination of protein synthesis, indicating that the ribosome should stop translating the mRNA.

4. **Statement (d): In eukaryotes, the initiator codon AUG codes for methionine.**
- This statement is correct. In eukaryotic organisms, the codon AUG serves as the start codon and codes for the amino acid methionine, which is the first amino acid incorporated into a newly synthesized protein.

### Conclusion:
- Based on the evaluation of the statements:
- Statement (a) is incorrect.
- Statements (b), (c), and (d) are correct.

Thus, the correct option is that statement (a) is wrong.

### Final Answer:
The correct option is that statement (a) is wrong.

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