Nucleic Acids – Chemical Constitution of DNA and RNA, Biological Functions NEET Questions

Organic Chemistry - Biomolecules

Nucleic Acids – Chemical Constitution of DNA and RNA, Biological Functions MCQ Questions


13.
A nucleoside contains how many components?
A.
2 (a base and a sugar)
B.
1
C.
3
D.
4
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ANSWER :
A. 2 (a base and a sugar)
14.
Adenosine monophosphate (AMP) is a:
A.
Nucleoside found in DNA
B.
Sugar molecule
C.
Ribonucleotide found in RNA
D.
An amino acid derivative
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ANSWER :
C. Ribonucleotide found in RNA
15.
In a nucleotide, which group is between the sugar and the rest of the polymer chain?
A.
The nitrogenous base
B.
The phosphate group at 5' position
C.
The hydroxyl group at 2'
D.
Free ammonia
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ANSWER :
B. The phosphate group at 5' position
16.
Nucleotides carry a negative charge at physiological pH because of:
A.
The base
B.
The sugar
C.
The deprotonated phosphate group
D.
The N-glycosidic bond
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ANSWER :
C. The deprotonated phosphate group
17.
The backbone of a polynucleotide chain consists of:
A.
Bases linked together
B.
Carbohydrate chains
C.
Repeating amino acids
D.
Alternating sugar and phosphate units
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ANSWER :
D. Alternating sugar and phosphate units
18.
By convention, the sequence of a nucleic acid is written:
A.
From 5' to 3' end
B.
From 3' to 5' end
C.
From the middle outward
D.
In random order
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ANSWER :
A. From 5' to 3' end