سائٹوسین ایڈنائن کے ساتھ بانڈ کیوں نہیں بناتا؟
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A. Adenine and cytosine have incompatible hydrogen bond donors and acceptors.
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B. Adenine is a pyrimidine and cannot bond with cytosine.
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C. Cytosine only pairs with thymine due to their complementary structures.
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D. Cytosine is unable to form hydrogen bonds with adenine.
Explanation
Cytosine does not form a bond with adenine because its hydrogen bond donors and acceptors are not complementary.
Cytosine typically forms three hydrogen bonds with guanine, whereas adenine forms two hydrogen bonds with thymine.
The patterns of hydrogen bonding in cytosine and adenine do not match, preventing the formation of a stable pair.
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A. None of these
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B. Adenine is double to Thiamine
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C. Thiamine is double to Adenine
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D. Adenine equals to Thiamine
Explanation
According to Erwin Chargaff's 1951 findings, the ratio of adenine (A) to thymine (T) in DNA is approximately 1:1.
This means that for every adenine molecule, there is a corresponding thymine molecule.
This observation, along with the similar 1:1 ratio of guanine (G) and cytosine (C), forms the basis of Chargaff's rules.
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