Question

If guanine makes up 31% of a nucleotide sample of DNA FROM AN ORGANISM, WHAT PERCENTAGE would make up cytosine?

Answer 1

Correct answer:

Together, adenine and thymine compose 70% of the segment. This means that 30% of the section is composed of guanine-cytosine pairs. Since these two bases will be equal in quantity, 15% of the DNA section will be cytosine bases.

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Answer 2

PERCENTAGE OF CYTOSINE IN A NUCLEOTIDE SAMPLE:

• Adenine, Thimine, Guanine and Cytosine are the four bases found in the DNA.
• Adenine pairs up with Thymine and Guanine with Cytosine.
• According to Chargaff's rule, "the amount of Adenine equals the amount of Thymine and the amount of of Guanine equals the amount of Cytosine.
• So if Guanine makes up 31% of a nucleotide sample, it means that Cytosine also makes up 31% of the sample.