The “primary structure” of a protein refers to:

1. coiling due to hydrogen bonding between amino acids

2. the alpha helix or pleated sheets

3. the side groups of the amino acids

4. the number and sequence of amino acids

The monomer of nucleic acid is

1. nucleotides

2. nucleosides

3. nucleus

4. Both 1 and 2

How many types of nitrogenous bases are present in nucleic acid

1.4

2.3

3.5

4.6

How many of the following are purines?

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

1.5

2.4

3.2

4.3

C’ represents carbon of

1.sugar of nucleotides

2.Nitrogenous bases of nucleotides

3.Both 1 and 2

4.None of the above

Which of the following is true about sugar of DNA

1. Ribose sugar is present

2. 2’deoxyribose sugar is present

3. 4C sugar is present

4. Both 2 and 3

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 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 1 and 3

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

Which of the following is not the function of protein

1.Act as hormones

2.act as enzymes

3.act as genetic material

4.fight against infections