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Biology
Posted 9 months ago

terms of 6 - mer 8 - mer etc.
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Answer from Sia
Posted 9 months ago
Sure, let's address the question about cutting a 1,000,000 nucleotide long DNA into 2700/pm 10 long fragments in terms of 6-mer, 8-mer, etc.

Answer
To cut a 1,000,000 nucleotide long DNA into 2700/pm 10 long fragments, you need to use restriction enzymes that recognize specific nucleotide sequences (6-mer, 8-mer, etc.).
Solution
a
Determine the average fragment length: The average fragment length can be calculated using the formula L=NnL = \frac{N}{n}, where LL is the average fragment length, NN is the total length of the DNA, and nn is the number of fragments. For a 1,000,000 nucleotide long DNA to be cut into fragments of approximately 2700 nucleotides, n=1,000,0002700370n = \frac{1,000,000}{2700} \approx 370
b
Choose the appropriate restriction enzyme: Restriction enzymes cut DNA at specific sequences. A 6-mer enzyme recognizes a sequence of 6 nucleotides, while an 8-mer enzyme recognizes a sequence of 8 nucleotides. The frequency of cutting can be estimated by 4n4^n, where nn is the length of the recognition sequence. For a 6-mer, the frequency is 46=40964^6 = 4096 nucleotides, and for an 8-mer, it is 48=655364^8 = 65536 nucleotides
c
Calculate the expected fragment size: For a 6-mer enzyme, the expected fragment size is approximately 4096 nucleotides, which is larger than the desired 2700 nucleotides. For an 8-mer enzyme, the expected fragment size is approximately 65536 nucleotides, which is much larger. Therefore, a 6-mer enzyme is closer to the desired fragment size but still not ideal
d
Adjust the enzyme choice: To achieve fragments closer to 2700 nucleotides, you may need to use a combination of restriction enzymes or partial digestion techniques to obtain the desired fragment length
Key Concept
Restriction enzymes and their recognition sequences
Explanation
Restriction enzymes cut DNA at specific sequences, and the length of these sequences (6-mer, 8-mer, etc.) determines the frequency and size of the resulting DNA fragments.

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