Which model explains the double helix nature of DNA
(1)Watson and Crick Model
(2)Gene Battery Model
(3)Sanger Sequencing
(4)Both A and C
In the DNA molecule
1. The total amount of purine nucleotides and pyrimidine nucleotides is not always equal
2. There are two strands which run parallel in 5'3' direction
3. The proportion of adenine in relation to thymine varies with the organism
4. There are two strands which run antiparallel one in 5'3' direction and other in 3'5' direction
Which one of the following is the diagrammatic representation of a nucleotide?
(a) (b) (c) (d)
The number of cyclic rings present in purines and pyrimidines are
(1)2,1 respectively
(2)1,2 respectively
(3)2,2 respectively
(4)1,1 respectively
Antiparallel strands of a DNA molecule means that
1. The phosphate groups of two DNA strands, at their ends, share the same position
2. The phosphate groups at the start of two DNA strands are in opposite position (pole)
3. One strand turns clockwise
4. One strand turns anti-clockwise
Which one of the following pairs of nitrogenous bases of nucleic acids, is wrongly matched
with the category mentioned against it?
1. Thymine, Uracil - Pyrimidines
2. Uracil, Cytosine - Pyrimidines
3. Guanine, Adenine - Purines
4. Adenine, Thymine - Purines
Both the strands of the DNA are joined by
(1)Disulphide bond
(2)hydrogen bonds
(3)Glycosidic bonds
(4)phosphodiester bonds
The above diagram represent the nitrogenous bases. Identify the correct combination:
(1) A = Adenine; B = Thymine
(2) A = Guanine; B = Thymine
(3) A = Adenine; B = Uracil
(4) A = Guanine; B = Uracil
Which of the following is incorrect.
1.Nucleotides- Nucleosides = phosphate
2.Nucleosides + Phosphate = Nucleotides
3.Nucleosides – Nucleotides = Phosphate
4.Both 1 and 2
Given below is the diagrammatic representation of one of the categories of small
molecular weight organic compounds in the living tissues. Identify the category shown
and the one blank component X in it
Category Component
1. Cholesterol Guanin
2. Amino acid NH2
3. Nucleotide Adenine
4. Nucleoside Uracil