AP BIOLOGY

THE MOLECULAR BASIS OF INHERITANCE

STRUCTURE OF NUCLEIC ACIDS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
In the double helix structure of nucleic acids, cytosine hydrogen bonds to:
A
Deoxyribose
B
Adenine
C
Thymine
D
Guanine
Explanation: 

Detailed explanation-1: -Adenine and thymine are connected by two hydrogen bonds, and cytosine and guanine are connected by three hydrogen bonds.

Detailed explanation-2: -Note: Cytosine can form three hydrogen bonds with guanine, and adenine can form two hydrogen bonds with thymine. In simple words, C bonds with G and A bonds with T. This is called complementary base pairing because each base can only bond with a specific base partner.

Detailed explanation-3: -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-4: -Correct answer: Cytosine and guanine, when base paired, have three hydrogen bonds between them. Adenine and thymine only have two.

There is 1 question to complete.