1. គេមាន សែន 2 ប្រវែង ស្មើគឺ 408mm ។ សែនទី1 មានសម្ព័ន្ធ H2= 3240 និង សែន ទី2 មានសម្ព័ន្ធ H2=3120 ។ ចូរគណនានុយក្លេអូទីត ប្រភេទនីមួយៗ របស់សែននីមួយៗ ។
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To solve this problem, we need to calculate the number of nucleotides (which are the building blocks of DNA) in each strand (សែន) of DNA.

Given:

1. The length of each DNA strand is 408 mm.
2. The superhelical density (σ) is given for each strand as \( H2 = 3240 \) and \( H2 = 3120 \) respectively.

The relationship between the length of the DNA strand (in mm) and the number of nucleotides can be established if we know the length of a single nucleotide. However, the exact number of nucleotides depends on the helical nature of the DNA, and additional specific details such as the length per nucleotide and the helical pitch need to be considered.

Given that typical B-DNA has approximately 10.5 base pairs per turn and each base pair corresponds to around 0.34 nm, let's proceed with the following assumptions for simplicity:

1. **Length of one nucleotide**: 0.34 nm (which is 0.00034 mm)
2. **Number of nucleotides per turn**: 10.5 nucleotides.

**Step 1: Convert the total length of each DNA strand into the number of nucleotides.**

\[ \text{Total nucleotides} = \frac{\text{Length of the strand in mm}}{\text{Length of one nucleotide in mm}} \]

\[ \text{Total nucleotides} = \frac{408 \, \text{mm}}{0.00034 \, \text{mm/nucleotide}} \]

Let's calculate this.Each DNA strand contains approximately 1,200,000 nucleotides.

Given that both strands have the same length but different superhelical densities, the specific sequence or structure might differ, but the total number of nucleotides in each strand is the same: 1,200,000 nucleotides.

Would you like a more detailed explanation or do you have any questions about this calculation?

### Related Questions:
1. What is the significance of superhelical density in DNA?
2. How does superhelical density affect the structure of DNA?
3. What is the role of nucleotides in DNA replication?
4. How are DNA sequences determined in a lab setting?
5. What are the differences between A-DNA, B-DNA, and Z-DNA?
6. How does the helical structure of DNA influence its function?
7. What are the biological consequences of DNA supercoiling?
8. Can superhelical density vary in different organisms?

### Tip:
Remember that DNA's helical structure and supercoiling are crucial for its function in packaging within cells and during processes like replication and transcription.

Discover how to calculate the number of nucleotides in DNA strands based on given lengths and superhelical densities. This problem involves applying geometric and calculus principles to understand DNA structure and function.

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