AP BIOLOGY

CELL RESPIRATION

ATP ADENOSINE TRIPHOSPHATE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
How many hydrogen bonds form between Cytosine and Guanine?
A
1
B
2
C
3
D
4
Explanation: 

Detailed explanation-1: -The Adenine-Thymine base pair is held together by 2 hydrogen bonds while the Guanine-Cytosine base pair is held together by 3 hydrogen bonds.

Detailed explanation-2: -It is a truth universally acknowledged that a guanine–cytosine (GC) base pair has three hydrogen bonds whereas adenine–thymine (AT) has two.

Detailed explanation-3: -The base pairs are stabilized by hydrogen bonds; adenine and thymine form two hydrogen bonds between them, whereas cytosine and guanine form three hydrogen bonds between them.

Detailed explanation-4: -Purines always bond with pyrimidines via hydrogen bonds following the Chargaff rule in dsDNA, more specifically each bond follows Watson-Crick base pairing rules. Therefore adenine specifically bonds to thymine forming two hydrogen bonds, whereas guanine forms three hydrogen bonds with Cytosine.

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