1. How many Nitrogen atoms are present in adenine?
a) 3
b) 4
c) 5
d) 6
Explanation: 5 Nitrogen atoms are present in adenine
2. 
The linkage represented by arrow is
a) Peptide linkage
b) Phosphodiester linkage
c) Glycosidic linkage
d) N-glycosidic linkage
Explanation: The linkage represented by arrow is Phosphodiester linkage
3. DNA and RNA are
a) Polypeptides
b) Polynucleotides
c) Polysaccharides
d) All of these
Explanation: DNA and RNA are Polynucleotides
4. How much percentage of total cellular mass is formed by nucleic acid?
a) 3
b) 2
c) 5 to 7
d) 10 to 15
Explanation: 5 to 7
5. Which of the following are purines?
a) Adenine
b) Guanine
c) Cytosine
d) Both (a) and (b)
Explanation: Both (a) and (b)
6. Which of the following are pyramidine (substituted)?
a) Cytosine
b) Thymine
c) Uracil
d) All of these
Explanation: All of these
7. DNA contains
a) Ribose
b) 3’ deoxyribose
c) 5’ deoxyribose
d) 2’ deoxyribose
Explanation: DNA contains 2’ deoxyribose
8. The bond present between two nucleotides is known as
a) Phosphoester linkage
b) Phosphodiester linkage
c) Glycosidic linkage
d) Peptide linkage
Explanation: The bond present between two nucleotides is known as Phosphodiester linkage.
9. The Watson-Crick Structure of DNA is
a) 1° Structure
b) 2° Structure
c) 3° Structure
d) 4° Structure
Explanation: The Watson-Crick Structure of DNA is 2° Structure
10. Which of the following is correct about DNA?
a) Double helical structure in which two strands of polynucleotide runs antiparallel.
b) Backbone is formed by Sugar–Phosphate–Sugar chain.
c) N2-bases projected more or less perpendicular to back bone and faces inside.
d) All of these
Explanation: All of these