Credit of disclosing genetic code goes to

Options

A. Nirenberg
B. Matthaei
C. Both (1) and (2)
D. Khorana

Answer

To answer the question regarding who is credited with disclosing the genetic code, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Genetic Code**: The genetic code consists of sequences of nucleotides in DNA and RNA that determine the amino acid sequence of proteins. The code is read in triplets, known as codons.

2. **Identifying Key Scientists**: The question asks for the scientists responsible for disclosing the genetic code. Two prominent figures in this discovery are Marshall Nirenberg and Har Gobind Khorana.

3. **Nirenberg and Matthaei's Contribution**: In 1961, Marshall Nirenberg and J. Heinrich Matthaei conducted experiments that led to the identification of the first codons. They were able to determine that the codon AUG codes for the amino acid Methionine and also serves as a start codon.

4. **Khorana's Contribution**: Har Gobind Khorana contributed significantly to the understanding of the genetic code by deciphering additional codons and their corresponding amino acids. His work expanded the knowledge of how the genetic code operates, including the roles of initiator and terminator sequences.

5. **Recognition and Awards**: Nirenberg and Matthaei were awarded the Nobel Prize in Physiology or Medicine in 1968 for their work on the genetic code. Khorana also received the Nobel Prize in the same year for his contributions to the understanding of the genetic code.

6. **Conclusion**: While both Nirenberg and Khorana played crucial roles in elucidating the genetic code, the initial disclosure of the genetic code is credited to Nirenberg and Matthaei.

### Final Answer:
The credit for disclosing the genetic code goes to Marshall Nirenberg and J. Heinrich Matthaei.