The anticodon of tRNA coding for alanine was found to be CGH . What will be the triplet sequence on the anti-sense strand of DNA ?

Options

A. CAU
B. GTA
C. CGT
D. GUA

Answer

To determine the triplet sequence on the anti-sense strand of DNA based on the given anticodon of tRNA coding for alanine (CGU), we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Anticodon**: The given anticodon is CGU. Anticodons are found on tRNA and are complementary to the codons on mRNA.

2. **Determine the Corresponding Codon**: The codon on mRNA that corresponds to the anticodon CGU can be found by pairing the bases:
- C (Cytosine) pairs with G (Guanine)
- G (Guanine) pairs with C (Cytosine)
- U (Uracil) pairs with A (Adenine)

Therefore, the corresponding codon on mRNA is GCA.

3. **Identify the Anti-sense Strand of DNA**: The anti-sense strand of DNA is complementary to the mRNA codon. To find the DNA sequence, we need to convert the mRNA codon (GCA) into its corresponding DNA sequence:
- G (Guanine) pairs with C (Cytosine)
- C (Cytosine) pairs with G (Guanine)
- A (Adenine) pairs with T (Thymine)

Thus, the complementary DNA sequence will be CGT.

4. **Write the Final Answer**: Since DNA strands are typically written in the 5' to 3' direction, the triplet sequence on the anti-sense strand of DNA is CGT.

### Final Answer:
The triplet sequence on the anti-sense strand of DNA is **CGT**.