Which of the following is not true for an anticodon?

Options

A. It consits of three nucleotides
B. It is basic unit of genetic code
C. It is present of tRNA molecule
D. It may pair with more than one codon

Answer

To solve the question "Which of the following is not true for an anticodon?", we will analyze each of the provided options regarding the characteristics of an anticodon.

### Step-by-Step Solution:

1. **Understanding Anticodons**:
- An anticodon is a sequence of three nucleotides found on transfer RNA (tRNA) that is complementary to a corresponding codon on messenger RNA (mRNA).

2. **Analyzing Each Option**:
- **Option 1**: "It consists of three nucleotides."
- This statement is **true**. Anticodons are indeed made up of three nucleotides, just like codons.

- **Option 2**: "It is the basic unit of genetic code."
- This statement is **not true**. The basic unit of the genetic code is the codon, not the anticodon. Codons are found on mRNA and are read during translation to synthesize proteins.

- **Option 3**: "It is present on the tRNA."
- This statement is **true**. Anticodons are located on tRNA molecules, where they pair with codons on mRNA during protein synthesis.

- **Option 4**: "It may pair with more than one codon."
- This statement is **true**. Due to the degeneracy of the genetic code, some anticodons can pair with more than one codon.

3. **Conclusion**:
- The only statement that is not true for an anticodon is **Option 2**: "It is the basic unit of genetic code." Therefore, the correct answer is Option 2.

### Final Answer:
**Option 2: It is the basic unit of genetic code.**

---