AP BIOLOGY

CELL RESPIRATION

ATP ADENOSINE TRIPHOSPHATE

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

Which of these is NOT part of a nucleotide?

A	5-carbon sugar
B	Phosphate group
C	Glucose
D	Nitrogenous base

Explanation:

Detailed explanation-1: -Nucleotides that make the DNA strands contain deoxyribose sugar, phospate molecule and one nitrogenous base out of adenine, guanine, thymine and cytosine. Uracil is never a part of nucleotide of DNA.

Detailed explanation-2: -A molecule consisting of a nitrogen-containing base (adenine, guanine, thymine, or cytosine in DNA; adenine, guanine, uracil, or cytosine in RNA), a phosphate group, and a sugar (deoxyribose in DNA; ribose in RNA).

Detailed explanation-3: -DNA nucleotides do not contain ribose sugar. Hence, ribose, thymine, and a phosphate group cannot represent a DNA nucleotide. Hence, option d is incorrect. DNA nucleotides comprise a deoxyribose sugar, any one of the nitrogenous bases-adenine, guanine, cytosine, or thymine and a phosphate group.

Detailed explanation-4: -Nucleotide 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).

There is 1 question to complete.