If DNA percentage of thymine is 20. What is the percentage of guanine? [2002]
1. 20%
2. 40%
3. 30%
4. 60%
Which is wrong about nucleic acids? [1993]
1. DNA is single stranded in some viruses
2. RNA is double stranded occasionally
3. Length of one helix is 45 Å in B-DNA
4. One turn of Z-DNA has 12 bases
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 |
The bond between the phosphate and hydroxyl group of sugar is an
(1)ether bond
(2)ester bond
(3)glycosidic bond
(4)amide bond
How many phosphodiester bonds are present in 5’ATTTTTGG 3’ sequence of nucleotides
1. 7
2. 9
3. 8
4. 6
The DNA exists as _________helix which runs ________
(1)double, parallel
(2)double, antiparallel
(3)single, perpendicular
(4)single, parallel
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 |
Which of the following is the pitch of B-DNA
(1)34Angstrom
(2)34 nanometre
(3)34 picometre
(4)34 femtometre
The nitrogenous bases of the two strands of DNA are joined by
| 1. | Phosphodiester bond | 2. | Hydrogen bond |
| 3. | Glycosidic bond | 4. | Peotide bond |
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