Which of the following is not necessarily a property of all hormones?

Options

A. Chemical messangers
B. Secreted in low amounts
C. Releasedby ductless glands
D. Protein in nature

Answer

To solve the question "Which of the following is not necessarily a property of all hormones?", we will analyze each option provided:

1. **Option A: Chemical messenger**
- Hormones are indeed chemical messengers that transmit signals in the body to regulate physiological processes. This is a fundamental property of all hormones.

2. **Option B: Secreted in low amounts**
- Hormones are typically secreted in very small quantities because they are highly potent. This is a characteristic of hormones, as they can exert significant effects even in low concentrations.

3. **Option C: Released by ductless gland**
- Hormones are released by ductless glands (endocrine glands) directly into the bloodstream. This is a defining feature of hormones, distinguishing them from other types of signaling molecules.

4. **Option D: Protein in nature**
- Not all hormones are proteins. While some hormones, such as insulin, are proteins, others, like steroid hormones (e.g., testosterone, estrogen), are derived from lipids. Therefore, this statement is not true for all hormones.

After analyzing all the options, the answer to the question is:

**D. Protein in nature** is not necessarily a property of all hormones.