What Are the Nucleotide Percentages in This Gene?

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SUMMARY

The discussion centers on calculating nucleotide percentages in a gene of length 4080 Å, which contains 3120 hydrogen bonds. It is established that there are 240 nucleotides of adenine, and 40% of the total nucleotides are cytosine. The calculations reveal that the total number of nucleotides (N) is 2400, leading to the conclusion that the percentages of adenine, cytosine, guanine, and thymine can be derived from these values. The terminology used, such as "chromatid" and "coding strand," is clarified to ensure accurate interpretation of the problem.

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  • Understanding of DNA structure and nucleotide composition
  • Familiarity with basic molecular biology concepts
  • Knowledge of hydrogen bonding in DNA
  • Ability to perform calculations involving percentages and ratios
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  • Study the principles of DNA base pairing and nucleotide percentages
  • Learn about the structure and function of chromatid versus coding strand
  • Explore the implications of hydrogen bonding in DNA stability
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Students in molecular biology, educators teaching genetics, and researchers analyzing DNA sequences will benefit from this discussion.

Medicol
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1. A gene of length 4080 A° has 3120 hydrogen bonds. On one chromatid of one gene, there are 240 nucleotides of adenine, and 40% of total nucleotides are cytosine. Calculate each nucleotide percentage in the gene.

Homework Equations


3. Set L be the length of DNA, so [tex]L=\frac{N}{2}3.4[/tex]
we then have [tex]N=2400[/tex].
Because [tex]C_1=G_2=0.4N=960[/tex]
and [tex]A_1=T_2=240[/tex]
we have [tex]A_2+C_2=1200[/tex]
In a DNA we also have [tex]∑Hbonds=2A+3G=2(A_1+A_2)+3(G_1+G_2)=3120[/tex]
or [tex]480+2A_2+3G_1+2880=3120[/tex]
or [tex]2A_2+3G_1=-240[/tex]

:cry: It's an incorrect approach...:cry:
 
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Medicol said:
On one chromatid of one gene, there are 240 nucleotides of adenine, and 40% of total nucleotides are cytosine.
I suspect what the question tried to say here is that one strand of the gene (e.g. the coding strandt) has 240 nt of adenine and 40% of the total nts are cytosine. If that was what the questioner meant, chromatid is the incorrect term to use. I'd double check with whomever was the source of the question, however.