There is no DNA in

Options

A. a mature spermatozoan
B. hair root
C. an enucleated ovum
D. mature RBCs

Answer

To answer the question "There is no DNA in," we need to analyze the options provided and determine which one does not contain DNA. Here’s a step-by-step solution:

### Step 1: Understand the Role of DNA
DNA (deoxyribonucleic acid) is the genetic material that carries the information necessary for the growth, development, and reproduction of living organisms. It is primarily found in the nucleus of eukaryotic cells.

**Hint:** Remember that DNA is usually found in the nucleus of cells, but there are exceptions.

### Step 2: Evaluate Each Option
1. **Mature Spermatozoon**:
- Sperm cells have a head, neck, middle piece, and tail. The head contains a haploid nucleus, which means it does contain DNA.
- **Conclusion**: This option contains DNA.

2. **Hair Root**:
- The hair root or follicle is the living part of the hair and contains cells that are nucleated. Nucleated cells have DNA.
- **Conclusion**: This option contains DNA.

3. **Enucleated Ovum**:
- An ovum (egg cell) can be enucleated, meaning the nucleus is removed. However, it is important to note that mitochondria within the ovum can still contain DNA, which is involved in maternal inheritance.
- **Conclusion**: This option does not completely lack DNA, as mitochondrial DNA is present.

4. **Mature RBCs (Red Blood Cells)**:
- In mammals, mature red blood cells are enucleated, meaning they do not have a nucleus. As a result, they do not contain DNA.
- **Conclusion**: This option does not contain DNA.

### Step 3: Identify the Correct Answer
Based on the analysis, the option that does not contain DNA is **Mature RBCs**.

### Final Answer:
**The correct answer is: Mature RBCs (Red Blood Cells).**

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