Sulphur is present in

Options

A. Cysteine and Methionine
B. Ferrodoxin and Coenzyme A
C. All amino acids
D. Both (A) and (B)

Answer

To determine where sulfur is present, we can analyze the options provided in the question. Here’s a step-by-step breakdown of the solution:

### Step 1: Identify the Compounds
The question asks where sulfur is present, and we have the following options:
1. Cysteine and Methionine
2. Ferredoxin and Coenzyme A
3. All amino acids
4. None of the above

### Step 2: Analyze Option 1 - Cysteine and Methionine
- **Cysteine**: This is an amino acid that contains a thiol (-SH) group, which includes sulfur.
- **Methionine**: This is another amino acid that contains a sulfur atom in its structure as part of the thioether group.

**Conclusion**: Both cysteine and methionine contain sulfur.

### Step 3: Analyze Option 2 - Ferredoxin and Coenzyme A
- **Ferredoxin**: This is an iron-sulfur protein, meaning it contains both iron and sulfur in its structure.
- **Coenzyme A**: This is a coenzyme that is derived from vitamins such as thiamine and contains a sulfur atom in its structure.

**Conclusion**: Both ferredoxin and coenzyme A contain sulfur.

### Step 4: Analyze Option 3 - All Amino Acids
- Not all amino acids contain sulfur. Only specific amino acids like cysteine and methionine do.

**Conclusion**: This statement is false.

### Step 5: Analyze Option 4 - None of the Above
- Since we have established that sulfur is present in both cysteine, methionine, ferredoxin, and coenzyme A, this option is also false.

### Final Answer
Sulfur is present in both **Option 1 (Cysteine and Methionine)** and **Option 2 (Ferredoxin and Coenzyme A)**. Therefore, the correct answer is that sulfur is present in cysteine, methionine, ferredoxin, and coenzyme A.

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