Which of the following group contains sulphur in all members?

Options

A. Thiamine, ferrodoxin, aspartic acid
B. Biotin, coenzyme A, methionine
C. Methionine, proline, leucine
D. DNA and RNA

Answer

To determine which group contains sulfur in all members, we will analyze the given options step by step.

### Step 1: Identify the Groups
The options provided are:
1. Thymine, Ferredoxin, Aspartic acid
2. Biotin, Coenzyme A, Methionine
3. Proline, Leucine
4. DNA, RNA

### Step 2: Analyze Each Group for Sulfur Content
- **Group 1: Thymine, Ferredoxin, Aspartic acid**
- **Thymine**: Does not contain sulfur.
- **Ferredoxin**: Contains iron and does not have sulfur.
- **Aspartic acid**: An amino acid that does not contain sulfur.
- **Conclusion**: This group does not contain sulfur in all members.

- **Group 2: Biotin, Coenzyme A, Methionine**
- **Biotin**: Contains sulfur.
- **Coenzyme A**: Contains sulfur.
- **Methionine**: Contains sulfur (it is one of the two amino acids that contain sulfur).
- **Conclusion**: This group contains sulfur in all members.

- **Group 3: Proline, Leucine**
- **Proline**: Does not contain sulfur.
- **Leucine**: Does not contain sulfur.
- **Conclusion**: This group does not contain sulfur in all members.

- **Group 4: DNA, RNA**
- **DNA**: Contains phosphorus and does not contain sulfur.
- **RNA**: Also contains phosphorus and does not contain sulfur.
- **Conclusion**: This group does not contain sulfur in all members.

### Step 3: Final Conclusion
After analyzing all the groups, we find that only **Group 2: Biotin, Coenzyme A, Methionine** contains sulfur in all members.

### Answer:
The correct option is **Group 2: Biotin, Coenzyme A, Methionine**.

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