All of the following nucleotides are present in DNA, except

Options

A.
B.
C.
D.

Answer

To answer the question "All of the following nucleotides are present in DNA, except," we need to understand the components of DNA nucleotides. Here’s a step-by-step breakdown of the solution:

### Step 1: Identify the Components of DNA Nucleotides
DNA nucleotides are composed of three main components:
- A pentose sugar
- A nitrogenous base
- A phosphate group

### Step 2: Determine the Type of Pentose Sugar in DNA
The pentose sugar in DNA is **deoxyribose**. It is a 5-carbon sugar that lacks an oxygen atom at the 2nd carbon position (hence the name "deoxy"). In contrast, RNA contains ribose, which has an oxygen atom at the 2nd carbon.

### Step 3: Identify the Nitrogenous Bases in DNA
DNA contains four types of nitrogenous bases:
- Adenine (A)
- Thymine (T)
- Guanine (G)
- Cytosine (C)

It is important to note that **uracil (U)** is present in RNA but not in DNA.

### Step 4: Identify the Phosphate Group in DNA
The phosphate group is present in DNA nucleotides and is attached to the 5th carbon of the deoxyribose sugar.

### Step 5: Analyze the Options
Given the components of DNA:
- If the options include ribose, uracil, or any other component not found in DNA, those would be the correct answers to the question.

### Conclusion
Based on the analysis, the nucleotide that is **not present in DNA** is **uracil (U)**. Therefore, the correct answer to the question is the option that lists uracil.

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