DNA component is :-

Options

A. Nucleosides + phosphate groups
B. Nitrogenous bases + deoxyribose sugar + phosphate groups
C. Nitrogenous base + ribose sugar + phosphate group
D. (1) and (2) both are correct

Answer

To answer the question "DNA component is:", we need to identify the components that make up DNA. Here’s a step-by-step breakdown of the solution:

### Step-by-Step Solution:

1. **Understanding DNA Structure**:
- DNA stands for deoxyribonucleic acid. It is the molecule that carries genetic information in living organisms.

2. **Components of DNA**:
- DNA is composed of smaller units called nucleotides. Each nucleotide consists of three main components:
- **Deoxyribose Sugar**: This is the sugar molecule that is part of the nucleotide.
- **Phosphate Group**: This group is attached to the sugar and forms the backbone of the DNA structure.
- **Nitrogenous Base**: There are four types of nitrogenous bases in DNA: adenine (A), guanine (G), thymine (T), and cytosine (C).

3. **Identifying the Correct Option**:
- The question provides several options:
- Option 1: Nucleosides plus phosphate groups
- Option 2: Nitrogenous bases plus deoxyribose sugar plus phosphate groups
- Option 3: Nitrogenous base plus ribose sugar plus phosphate group
- Option 4: 1 and 2 both are correct
- From our understanding, the correct components of DNA are the nitrogenous bases, deoxyribose sugar, and phosphate groups. Therefore, option 2 is correct.

4. **Conclusion**:
- The correct answer to the question "DNA component is:" is **nitrogenous bases plus deoxyribose sugar plus phosphate groups**.

### Final Answer:
**DNA component is nitrogenous bases plus deoxyribose sugar plus phosphate groups.**

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