How many types of nitrogenous bases are present in nucleic acid

(1)4

(2)3

(3)5

(4)6

Subtopic:  Double Helix : Watson & Crick Part 1 | Double Helix : Watson & Crick |
 68%
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How many of the following are purines?

Adenine, Uracil, Cytosine, thymine, Cysteine, threonine, Tryptophan, Guanine, Thymine

(1)5

(2)4

(3)2

(4)3

Subtopic:  Double Helix : Watson & Crick Part 1 | Double Helix : Watson & Crick |
 87%
From NCERT
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How many of the following are pyrimidines?

Adenine, Uracil, Cytosine, Cysteine, threonine, Trytophan, Guanine, Thymine

(1)5

(2)4

(3)2

(4)3

Subtopic:  Double Helix : Watson & Crick Part 1 | Double Helix : Watson & Crick |
 83%
From NCERT
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Which of the following is true about sugar of RNA

(1)Ribose sugar is present

(2)2’deoxyribose sugar is present

(3)5C sugar is present

(4)All is true except (B)

Subtopic:  Double Helix : Watson & Crick Part 1 | Double Helix : Watson & Crick |
 86%
From NCERT
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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%
From NCERT
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The bond between the phosphate and hydroxyl group of sugar  is an

(1)ether bond

(2)ester bond

(3)glycosidic bond

(4)amide bond

Subtopic:  Double Helix : Watson & Crick Part 2 | Double Helix : Watson & Crick |
 84%
From NCERT
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How many phosphodiester bonds are present in 5’ATTTTTGG 3’ sequence of nucleotides

(1)7

(2)9

(3)8

(4)6

Subtopic:  Double Helix : Watson & Crick Part 2 | Double Helix : Watson & Crick |
 59%
From NCERT
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The DNA exists as _________helix which runs ________

(1)double, parallel

(2)double, antiparallel

(3)single, perpendicular

(4)single, parallel

Subtopic:  Double Helix : Watson & Crick Part 2 | Double Helix : Watson & Crick |
 94%
From NCERT
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The backbone of the DNA is formed by

(1)sugar, phosphate, sugar chain

(2)sugar, phosphate, nitrogenous base chain

(3)Phosphate, sugar, phosphate chain

(4)Both A and B

Subtopic:  Double Helix : Watson & Crick Part 1 | Double Helix : Watson & Crick Part 2 | Double Helix : Watson & Crick |
 59%
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In DNA strands, there are ____ H- bonds b/w A and T and ____H-bonds b/w G and C respectivley

(1)2,3

(2)3,2

(3)2,2

(4)3,3

Subtopic:  Double Helix : Watson & Crick Part 1 | Double Helix : Watson & Crick |
 91%
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