Which is used for staining lipids?
(a) Rhodamine
(b) Iodine
(c) Ethidium bromide
(d) Sudan Red

Options

A. Rhodamine
B. Iodine
C. Ethidium bromide
D. Sudan Red.

Answer

To determine which dye is used for staining lipids, we can analyze each of the options provided:

1. **Understanding Lipids**:
- Lipids are biomolecules that are primarily composed of alcohol and fatty acids. They are characterized by their solubility in organic solvents and insolubility in water.

2. **Evaluating the Options**:
- **(a) Rhodamine**: This is a fluorescent dye used in microscopy, but it is not specifically used for staining lipids. Thus, this option is incorrect.
- **(b) Iodine**: Iodine is primarily used to stain starch and other carbohydrates. It does not stain lipids, making this option incorrect as well.
- **(c) Ethidium bromide**: This is a carcinogenic dye used for staining DNA. It is not associated with lipids, so this option is also incorrect.
- **(d) Sudan Red**: This dye is specifically used for staining lipids. It accumulates in lipid globules within cells, making it the correct choice.

3. **Conclusion**:
- The dye used for staining lipids is **Sudan Red**.

Thus, the correct answer is **(d) Sudan Red**.