tRNA was discovered by

Options

A. Brenner and Jacob
B. Jacob and Monod
C. Hoagland and Zamecnick
D. Payen and Persoz.

Answer

To answer the question "tRNA was discovered by," we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Types of RNA**:
- There are three main types of RNA: tRNA (transfer RNA), mRNA (messenger RNA), and rRNA (ribosomal RNA).

2. **Identify the Function of tRNA**:
- tRNA is responsible for transferring amino acids to the ribosome during protein synthesis.

3. **Review the Options Provided**:
- The options given are:
- A) Breener and Jacob
- B) Jacob and Monod
- C) Hoagland and Zamechnik
- D) Payen and Persaus

4. **Recall Historical Discoveries**:
- It is important to recall which scientists are associated with the discovery of tRNA.

5. **Match the Correct Scientists**:
- Hoagland and Zamechnik are known for their discovery of tRNA.

6. **Eliminate Incorrect Options**:
- Breener and Jacob are known for messenger RNA, Jacob and Monod are known for operons, and Payen and Persaus are associated with diastase.

7. **Conclude the Answer**:
- Therefore, the correct answer is Hoagland and Zamechnik.

### Final Answer:
tRNA was discovered by Hoagland and Zamechnik.

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