Nitrogen base + Pentose sugar + Phosphate group is

Options

A. Nucleoside
B. Nucleic acid
C. Pyrimidine
D. Nucleotide.

Answer

To solve the question "Nitrogen base + Pentose sugar + Phosphate group is," we can break it down step by step:

### Step 1: Understand the Components
- **Nitrogen Base**: This is one of the fundamental components of nucleotides. Nitrogen bases can be classified into two categories: purines (adenine and guanine) and pyrimidines (cytosine, thymine, and uracil).

- **Pentose Sugar**: This refers to a five-carbon sugar molecule. In nucleotides, the pentose sugar can either be ribose (in RNA) or deoxyribose (in DNA).

- **Phosphate Group**: This is a functional group consisting of a phosphorus atom bonded to four oxygen atoms. It is an essential part of nucleotides.

### Step 2: Combine the Components
- When you combine a nitrogen base with a pentose sugar, you get a **nucleoside**.
- When you add a phosphate group to a nucleoside, you get a **nucleotide**.

### Step 3: Identify the Correct Answer
- The question asks for the combination of a nitrogen base, a pentose sugar, and a phosphate group. Based on our understanding:
- **Nucleoside** = Nitrogen Base + Pentose Sugar
- **Nucleotide** = Nucleoside + Phosphate Group

Thus, the correct answer to the question is **nucleotide**.

### Final Answer:
**Nucleotide**

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