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

Subtopic:  Double Helix : Watson & Crick Part 1 | Double Helix : Watson & Crick |
 94%
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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 

Subtopic:  Double Helix : Watson & Crick Part 2 | Double Helix : Watson & Crick |
 86%
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Which one of the following is the diagrammatic representation of a nucleotide?

(a)  (b)       (c)     (d)

Subtopic:  Double Helix : Watson & Crick Part 1 | Double Helix : Watson & Crick |
 83%
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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

Subtopic:  Double Helix : Watson & Crick Part 1 | Double Helix : Watson & Crick |
 80%
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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 

Subtopic:  Double Helix : Watson & Crick Part 2 | Double Helix : Watson & Crick |
 81%
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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

Subtopic:  Double Helix : Watson & Crick Part 1 | Double Helix : Watson & Crick |
 80%
From NCERT
NEET - 2008
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Both the strands of the DNA are joined by

(1)Disulphide bond

(2)hydrogen bonds

(3)Glycosidic bonds

(4)phosphodiester bonds

Subtopic:  The DNA | Double Helix : Watson & Crick Part 1 | Double Helix : Watson & Crick Part 2 | Double Helix : Watson & Crick |
 73%
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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

Subtopic:  Double Helix : Watson & Crick Part 1 | Double Helix : Watson & Crick |
 76%
From NCERT
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Which of the following is incorrect.

1.Nucleotides- Nucleosides = phosphate

2.Nucleosides + Phosphate = Nucleotides

3.Nucleosides – Nucleotides = Phosphate

4.Both 1 and 2

Subtopic:  Double Helix : Watson & Crick Part 1 | Double Helix : Watson & Crick |
 66%
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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

Subtopic:  Nucleic Acid: Nucleotides | Double Helix : Watson & Crick Part 1 | Double Helix : Watson & Crick |
 67%
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NEET - 2012
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