If there is a double stranded DNA virus particle with 20,000 base pairs, how many nucleotides will be present in it ?

Options

A. 20000
B. 10000
C. 5000
D. 40000

Answer

To solve the problem of how many nucleotides are present in a double-stranded DNA virus particle with 20,000 base pairs, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Components**:
- A nucleotide consists of a nitrogenous base, a phosphate group, and a pentose sugar.
- In double-stranded DNA, the nitrogenous bases pair up to form base pairs.

2. **Identify the Relationship Between Base Pairs and Nucleotides**:
- Each base pair in double-stranded DNA consists of two nucleotides (one from each strand).
- Therefore, the relationship can be summarized as:
\[ \text{Number of Nucleotides} = 2 \times \text{Number of Base Pairs} \]

3. **Calculate the Total Number of Nucleotides**:
- Given that there are 20,000 base pairs, we can calculate the total number of nucleotides as follows:
\[ \text{Total Nucleotides} = 2 \times 20,000 = 40,000 \]

4. **Conclusion**:
- The total number of nucleotides present in the double-stranded DNA virus particle is 40,000.

### Final Answer:
The double-stranded DNA virus particle with 20,000 base pairs contains **40,000 nucleotides**.

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