Assertion: The first codon discovered by Nirenberg and Matthaei was UUU.
Reason: Genetic code translates the language of protein into that of RNA.

Options

A. If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
B. If both Assertion and Reason are true and the Reason is not the correct explanation of the Assertion.
C. If Assertion is true but the Reason is false.
D. If both Assertion and Reasom are false.

Answer

**Step-by-Step Solution:**

1. **Understanding the Assertion:**
- The assertion states that the first codon discovered by Nirenberg and Matthaei was UUU. This is true. In 1961, Marshall Nirenberg and Heinrich Matthaei used a cell-free system to translate a polyuracil RNA (which consists solely of uracil bases) and found that it produced a polypeptide made entirely of the amino acid phenylalanine. This established that the codon UUU codes for phenylalanine.

2. **Understanding the Reason:**
- The reason states that the genetic code translates the language of protein into that of RNA. This statement is false. The correct flow of information is from DNA to RNA to protein. DNA is transcribed into RNA, and then RNA is translated into proteins. Thus, the genetic code translates the language of RNA (the sequence of nucleotides) into the language of proteins (the sequence of amino acids).

3. **Conclusion:**
- Since the assertion is true and the reason is false, we can conclude that the correct answer to the question is that the assertion is true while the reason is false.

**Final Answer:**
- The assertion is true, and the reason is false.

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