Which of the following is a carbohydrate ?

Options

A. Glutamic acid
B. Insulin
C. Pectin
D. Cholesterol

Answer

To determine which of the following options is a carbohydrate, we will analyze each option provided:

1. **Glutamic Acid**:
- Glutamic acid is classified as an alpha amino acid. It plays a crucial role in the biosynthesis of proteins and is present in all living organisms. Since it is an amino acid and not a carbohydrate, this option is incorrect.

2. **Insulin**:
- Insulin is a peptide hormone produced by the beta cells of the pancreas. Its primary function is to regulate blood sugar levels. As a hormone and not a carbohydrate, this option is also incorrect.

3. **Pectin**:
- Pectin is a high molecular weight carbohydrate. It is primarily found in the cell walls and lamella of plants, where it serves as a structural component. Since pectin is indeed a carbohydrate, this option is correct.

4. **Cholesterol**:
- Cholesterol is a fat-like substance that is found in body cells. It is classified as a lipid and not a carbohydrate, making this option incorrect.

Based on the analysis above, the correct answer is **Pectin**.

### Step-by-Step Solution:
1. Identify the options given: Glutamic acid, Insulin, Pectin, Cholesterol.
2. Analyze each option to determine its classification:
- Glutamic acid: Amino acid, not a carbohydrate.
- Insulin: Hormone, not a carbohydrate.
- Pectin: High molecular weight carbohydrate, correct option.
- Cholesterol: Lipid, not a carbohydrate.
3. Conclude that the only carbohydrate among the options is **Pectin**.