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


1.
Which statement about nucleic acids is INCORRECT?
A.
They are biopolymers of nucleotides
B.
They are also called polynucleotides
C.
They are responsible for transmission of hereditary characters
D.
They contain only carbon, hydrogen, and oxygen
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ANSWER :
D. They contain only carbon, hydrogen, and oxygen
2.
DNA stands for:
A.
Dinucleic Acid
B.
Diribonucleic Acid
C.
Deoxyribonucleic Acid
D.
Deoxyribosenucleotic Acid
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ANSWER :
C. Deoxyribonucleic Acid
3.
RNA is a polymer of:
A.
Ribonucleotides
B.
Deoxyribonucleotides
C.
Amino acids
D.
Glucose units
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ANSWER :
A. Ribonucleotides
4.
Which property is common to both ribose and 2-deoxyribose?
A.
Both are hexose sugars
B.
Both are ketose sugars
C.
Both contain -OH at C-2 position
D.
Both are pentose sugars in furanose form (β-D configuration)
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ANSWER :
D. Both are pentose sugars in furanose form (β-D configuration)
5.
The pyrimidine ring system contains:
A.
5-membered ring with 2 nitrogen atoms
B.
6-membered ring with 2 nitrogen atoms
C.
6-membered ring with 4 nitrogen atoms
D.
Two fused rings
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ANSWER :
B. 6-membered ring with 2 nitrogen atoms
6.
The purine ring system contains how many nitrogen atoms?
A.
2
B.
3
C.
4
D.
5
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ANSWER :
C. 4