A hormone receptor protein found in the cytoplasm of a cell may

Options

A. Attach to cyclic AMP
B. Synthesize DNA
C. Combine with steroid hormone
D. Acts as a second messenger

Answer

To solve the question regarding the function of a hormone receptor protein found in the cytoplasm of a cell, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Hormone Receptors**: Hormone receptors are proteins that bind to specific hormones. They can be located on the cell surface or within the cell (cytoplasm or nucleus).

2. **Identifying the Location**: The question specifies that the hormone receptor protein is found in the cytoplasm of the cell. This indicates that it is likely involved in the action of lipid-soluble hormones, such as steroid hormones.

3. **Analyzing the Options**:
- **Option A**: Attaches to cyclic AMP. This is incorrect because cyclic AMP is a secondary messenger, and hormone receptors in the cytoplasm do not typically bind to it.
- **Option B**: Synthesizes its DNA. This is also incorrect; while some hormone actions can lead to changes in DNA synthesis, the receptor itself does not synthesize DNA.
- **Option C**: Combines with steroid hormones. This is correct. Steroid hormones can pass through the cell membrane and bind to receptors in the cytoplasm, leading to a change in gene expression.
- **Option D**: Acts as a secondary messenger. This is incorrect; secondary messengers are typically small molecules that relay signals inside the cell, not the receptors themselves.

4. **Conclusion**: Based on the analysis of the options, the correct answer is that the hormone receptor protein found in the cytoplasm of a cell will combine with steroid hormones.

### Final Answer:
The correct answer is **Option C: It will combine with steroid hormones.**