End product of protein digestion is
(a) Sugar
(b) Nucleotide
(c) Glucose
(d) Amino acid

Options

A. Sugar
B. Nucleotide
C. Glucose
D. Amino acid

Answer

**Step-by-Step Solution:**

1. **Understanding Proteins**: Proteins are complex macromolecules essential for various bodily functions. They are made up of smaller units called amino acids.

2. **Digestion of Proteins**: When proteins enter the digestive system, they are acted upon by enzymes known as proteases. Additionally, hydrochloric acid (HCl) in the stomach helps in the digestion process.

3. **Role of Proteases**: Proteases break down the peptide bonds that link amino acids together in a protein. This process results in the formation of individual amino acids.

4. **End Product Identification**: The end product of protein digestion is amino acids. Therefore, when asked about the end product of protein digestion, the correct answer is amino acids.

5. **Eliminating Other Options**:
- **Option A (Sugar)**: Sugars are products of carbohydrate digestion, not protein digestion.
- **Option B (Nucleotide)**: Nucleotides are produced from the digestion of nucleic acids, not proteins.
- **Option C (Glucose)**: Glucose is a simple sugar that results from carbohydrate digestion, not protein digestion.

6. **Conclusion**: The correct answer is (d) Amino acid, as it is the direct end product of protein digestion.