Nucleotides are formed of

Options

A. A phosphoric acid group
B. A nitrogenous base
C. A pentose sugar
D. All of these

Answer

To answer the question "Nucleotides are formed of," we need to identify the components that make up a nucleotide. Here’s a step-by-step breakdown of the solution:

### Step 1: Identify the Components of a Nucleotide
A nucleotide is a basic building block of nucleic acids (DNA and RNA). It consists of three main components:
1. **Phosphoric Acid Group**: This is the phosphate group that is essential for the formation of the nucleotide.
2. **Nitrogenous Base**: This can be one of several bases (adenine, thymine, cytosine, guanine in DNA; adenine, uracil, cytosine, guanine in RNA).
3. **Pentose Sugar**: This is a five-carbon sugar molecule, which can be ribose (in RNA) or deoxyribose (in DNA).

### Step 2: Combine the Components
The structure of a nucleotide can be represented as follows:
- The nitrogenous base is attached to the pentose sugar.
- The pentose sugar is then attached to the phosphate group.

### Step 3: Conclusion
Since a nucleotide is formed from all three components (phosphoric acid group, nitrogenous base, and pentose sugar), the correct answer to the question is:
**All of these.**

### Final Answer
**Nucleotides are formed of:**
- Phosphoric acid group
- Nitrogenous base
- Pentose sugar
- Therefore, the correct option is **all of these**.

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