In which of the following order base, phosphate and sugar are arranged in the nucleotide of DNA?

Options

A. Base-phosphate-sugar
B. Base-sugar-phosphate
C. Phosphate-base-sugar
D. Sugar-base-phosphate

Answer

To determine the correct order of components in a nucleotide of DNA, we need to understand the structure of a DNA nucleotide. A nucleotide consists of three main components: a nitrogenous base, a sugar (deoxyribose in the case of DNA), and a phosphate group.

Here's how we can systematically identify the correct order:

### Step 1: Identify the Components of a DNA Nucleotide
A DNA nucleotide is composed of:
- A nitrogenous base (which can be adenine, thymine, cytosine, or guanine)
- A sugar (specifically deoxyribose)
- A phosphate group

### Step 2: Understand the Arrangement
In a nucleotide, the arrangement of these components is crucial. The nitrogenous base is attached to the sugar, and the phosphate group is attached to the sugar as well.

### Step 3: Determine the Correct Order
The correct order in a DNA nucleotide is:
1. Nitrogenous base
2. Sugar (deoxyribose)
3. Phosphate group

### Step 4: Analyze the Options
Given the options provided in the question, we need to find the one that matches the order:
- Base → Sugar → Phosphate

### Conclusion
The correct order of base, sugar, and phosphate in a DNA nucleotide is:
**Base → Sugar → Phosphate**