Statement :1 The `K_a` values of `alpha`-amino acids are very low.
Statement- 2: `alpha`-amino acids have zwitterionic structures.

Options

A. Statement -1 is True , Statement -2 is True, Statement -2 is a correct explanation of Statement -1
B. Statement -1 is True , Statement -2 is True, Statement -2 is not a correct explanation for Statement -1
C. Statement -1 is True , Statement -2 is False
D. Statement -1 is False, Statement -2 is True.

Explanation

To analyze the statements regarding alpha-amino acids, we will break down the information provided in the question systematically.

### Step-by-Step Solution:

**Step 1: Understanding the dissociation constant (K_a)**
- The dissociation constant (K_a) is a measure of the strength of an acid in solution. A low K_a value indicates that the acid does not dissociate significantly in solution, meaning it is a weak acid.

**Step 2: Analyzing alpha-amino acids**
- Alpha-amino acids have a general structure that includes both an amino group (-NH2) and a carboxyl group (-COOH). The carboxyl group is responsible for the acidic nature of the amino acid.

**Step 3: Relationship between K_a and pH**
- The relationship between K_a and pH is such that if K_a is low, the pH will be higher, indicating that the solution is less acidic. This means that alpha-amino acids, being weak acids, will have low K_a values.

**Step 4: Zwitterionic structure of alpha-amino acids**
- Alpha-amino acids can exist in a zwitterionic form, which is a dipolar ion that contains both a positive and a negative charge. In this form, the carboxyl group is deprotonated (-COO^-) and the amino group is protonated (-NH3^+). This structure stabilizes the molecule and affects its acidity.

**Step 5: Evaluating the statements**
- **Statement 1**: The K_a values of alpha-amino acids are very low. This statement is correct because alpha-amino acids are weak acids.
- **Statement 2**: Alpha-amino acids have zwitterionic structures. This statement is also correct as they can exist in this form.

**Conclusion**: Both statements are correct, but Statement 1 does not explain why K_a is low, while Statement 2 provides insight into the structure that contributes to this property.

### Final Answer:
Both statements are true, but Statement 2 is more explanatory regarding the zwitterionic nature of alpha-amino acids.