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. **Chemical Messenger**: Hormones are indeed chemical messengers that are secreted into the bloodstream and travel to target organs or tissues to elicit a specific response. This is a fundamental property of all hormones.

2. **Secreted in Low Amounts**: Hormones are typically secreted in very small quantities, yet they can have significant effects on the body. This is also a property shared by all hormones.

3. **Released by Ductless Glands**: Hormones are released by endocrine glands, which are ductless. This means they secrete hormones directly into the bloodstream rather than through ducts. This is true for all hormones.

4. **Protein in Nature**: While many hormones are proteins (like insulin), not all hormones are protein-based. Some hormones are steroid hormones (derived from cholesterol) or amine hormones (derived from amino acids). Therefore, this statement is not necessarily true for all hormones.

Based on this analysis, the option that is **not necessarily a property of all hormones** is:

**Fourth option: Protein in nature.**

### Step-by-step Solution:
1. Identify the properties of hormones.
2. Analyze each option provided in the question.
3. Confirm that the first three options are true for all hormones.
4. Determine that the fourth option (protein in nature) is not true for all hormones.
5. Conclude that the correct answer is the fourth option.