AP BIOLOGY

THE MOLECULAR BASIS OF INHERITANCE

DNA MAKES RNA MAKES PROTEIN

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What two parts of a nucleotide do not change throughout the structure of DNA?
A
Five-Carbon Sugar and Nitrogen Base
B
Phosphate Group and Nitrogen Base
C
Five-Carbon Sugar and Phosphate Group
D
All components remain the same throughout the DNA structure?
Explanation: 

Detailed explanation-1: -Phosphate Group and Nitrogen Base.

Detailed explanation-2: -A nucleotide consists of a phosphate group, a sugar, and a nitrogenous base. The phosphate group never varies. It is present in both DNA and RNA. In DNA, the sugar is deoxyribose, while in RNA, the sugar is ribose.

Detailed explanation-3: -The third part of a nucleotide is the pentose (5 carbon) sugar. The pentose sugars found in nucleotides are aldopentoses: ribose in RNA and deoxyribose in DNA.

Detailed explanation-4: -The five-carbon sugar in DNA is called deoxyribose, while in RNA, the sugar is ribose.

Detailed explanation-5: -A nucleotide is the basic building block of nucleic acids (RNA and DNA). A nucleotide consists of a sugar molecule (either ribose in RNA or deoxyribose in DNA) attached to a phosphate group and a nitrogen-containing base. The bases used in DNA are adenine (A), cytosine (C), guanine (G) and thymine (T).

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