Who recived the Noble Prize the working out the early carbon pathway of photoynthesis

Options

A. Watson
B. Khorana
C. Krebs
D. Calvin

Answer

To answer the question "Who received the Nobel Prize for working out the early carbon pathway of photosynthesis?", we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks about a scientist who received the Nobel Prize specifically for their work on the early carbon pathway of photosynthesis.

2. **Review the Options**: The options provided are:
- A) Watson
- B) Khurana
- C) Krebs
- D) Calvin

3. **Analyze Each Option**:
- **Option A: Watson** - James Watson is known for his work on the structure of DNA, which he proposed along with Francis Crick. This work earned them the Nobel Prize, but it is unrelated to photosynthesis. Therefore, this option is incorrect.

- **Option B: Khurana** - Dr. Hargobind Khurana is recognized for his work on the genetic code. He received the Nobel Prize for this discovery, but it does not pertain to the carbon pathway of photosynthesis. Thus, this option is also incorrect.

- **Option C: Krebs** - Sir Hans Krebs is famous for the Krebs cycle (also known as the citric acid cycle), which is a crucial metabolic pathway in aerobic respiration. His work is significant in biochemistry but is not related to the carbon pathway of photosynthesis. Hence, this option is incorrect.

- **Option D: Calvin** - Sir Melvin Calvin is the scientist who worked on the carbon fixation process in photosynthesis, specifically the Calvin cycle (also known as the C3 cycle). He was awarded the Nobel Prize in Chemistry in 1961 for his research on this pathway. This option is correct.

4. **Conclusion**: Based on the analysis, the correct answer is **D) Calvin**.