Which of the following is incorrect in relation to an adapter molecule ?

Options

A. It has an anticodon loop that has bases complementary to the code
B. It is also called sRNA .
C. It has an amino acid acceptor end which it binds to amino acid.
D. It shows an inverted L - Shaped 2 -D structure .

Answer

To determine which statement is incorrect regarding an adapter molecule, specifically tRNA (transfer RNA), we will analyze each option provided.

### Step-by-Step Solution:

1. **Understanding Adapter Molecule**:
- An adapter molecule in the context of molecular biology typically refers to tRNA, which plays a crucial role in translating mRNA into proteins by bringing the appropriate amino acids to the ribosome.

2. **Evaluating the First Statement**:
- **Statement**: "It has an anticodon loop that has bases complementary to the codon."
- **Analysis**: This statement is correct. The anticodon loop of tRNA contains a sequence of three nucleotides that are complementary to the codon on the mRNA strand. This ensures that the correct amino acid is added during protein synthesis.

**Hint**: Check the relationship between codons on mRNA and anticodons on tRNA.

3. **Evaluating the Second Statement**:
- **Statement**: "It is also known as SRNA which is soluble."
- **Analysis**: This statement is misleading. tRNA is often referred to as soluble RNA (sRNA) because it is soluble in solutions like NaCl. However, the term "SRNA" is not commonly used in this context, making this statement incorrect.

**Hint**: Look for the common terminology used for tRNA and its solubility properties.

4. **Evaluating the Third Statement**:
- **Statement**: "It has an amino acid acceptor that binds to the amino acid."
- **Analysis**: This statement is correct. tRNA has a specific site known as the amino acid acceptor site, where the corresponding amino acid binds before being added to the growing polypeptide chain.

**Hint**: Identify the functional parts of tRNA and their roles in protein synthesis.

5. **Evaluating the Fourth Statement**:
- **Statement**: "It has an inverted L shape to the structure."
- **Analysis**: This statement is incorrect. While tRNA does have a characteristic shape, it is more accurately described as a cloverleaf structure when viewed in two dimensions, and it does not form a simple inverted L shape.

**Hint**: Visualize the structure of tRNA to understand its shape better.

### Conclusion:
After evaluating all statements, the incorrect statement regarding the adapter molecule (tRNA) is the second statement about it being known as "SRNA," which is not a standard term used in molecular biology. The correct answer is thus **Option 2**.