Proteins perform many physiological functions. For example, some functions as enzymes. One of the following represents an additional function that some proteins discharge

Options

A. Antibiotics
B. Pigment conferring colour to skin
C. Pigments making colours of flowers
D. Hormones

Explanation

To answer the question regarding the additional functions that some proteins discharge, we can analyze the options provided and determine which one represents a function of proteins.

### Step-by-Step Solution:

1. **Understanding Protein Functions**: Proteins are essential biomolecules that perform a variety of physiological functions in living organisms. Some of these functions include acting as enzymes, hormones, structural components, and transport molecules.

2. **Analyzing the Options**: The options given are:
- A) Antibiotic
- B) Pigment conferring color to skin
- C) Pigments making color of flowers
- D) Hormones

3. **Identifying Protein Functions**:
- **Antibiotics**: These are typically small molecules or compounds that can kill or inhibit the growth of bacteria. They are not proteins.
- **Pigment conferring color to skin (Melanin)**: This is a pigment that gives color to skin and is not a protein.
- **Pigments making color of flowers (Fluorogen)**: Similar to melanin, these pigments are also not proteins.
- **Hormones**: Some hormones are indeed proteins or peptides. For example, insulin and growth hormone are both protein-based hormones that play crucial roles in regulating various physiological processes.

4. **Conclusion**: Based on the analysis, the only option that represents an additional function that some proteins discharge is **D) Hormones**.

### Final Answer:
The correct answer is **D) Hormones**.