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

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

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

Which of the following is the pitch of B-DNA
1. 34Angstrom
2. 34 nanometre
3. 34 picometre
4. 34 femtometre

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

The amino acids which are synthesised by our body are known as

1. Essential amino acids

2. Non-essential amino acids

3. Optical amino acids

4. Both A and C

The body meets the demand of essential amino acids through

1. Food

2. Body synthesised  on its own

3. Both A and B

4. None of these