In eukaryotes, the anticodon of tRNA that pairs with the start codon of mRNA during translation is ________

Options

A. UAA
B. UCA
C. UAC
D. UUU

Answer

To solve the question regarding the anticodon of tRNA that pairs with the start codon of mRNA during translation in eukaryotes, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Codons and Anticodons**:
- A codon is a sequence of three nucleotides on mRNA that corresponds to a specific amino acid or a stop signal during protein synthesis.
- An anticodon is a complementary sequence of three nucleotides found on tRNA that pairs with the codon on mRNA.

2. **Identifying the Start Codon**:
- In eukaryotes, the start codon is typically AUG. This codon codes for the amino acid methionine, which is the first amino acid in the polypeptide chain during translation.

3. **Determining the Anticodon**:
- To find the anticodon that pairs with the start codon AUG, we need to determine the complementary bases.
- The codon AUG consists of:
- A (Adenine)
- U (Uracil)
- G (Guanine)
- The complementary bases for these nucleotides are:
- A pairs with U
- U pairs with A
- G pairs with C
- Therefore, the anticodon that pairs with AUG is UAC.

4. **Final Answer**:
- The anticodon of tRNA that pairs with the start codon AUG during translation in eukaryotes is UAC.