The main structural feature(s) of protein is/are:

1. The ester linkage

2. The ether linkage

3. The peptide linkage

4. All of these

Proteins give ?

(1) a violet colour with alkaline CuSO₄ solution

(2) form a purple colour on boiling with dilute ninhydrin solution

(3) yellow colour on boiling with HNO₃

(4) all of the above

Which of the following is proteolytic enzyme?

(1) Insulin

(2) Diastase

(3) Pepsin

(4) Adenine

Keratin, a structural protein is present in:

1. hair

2. skin

3. wool

4. All of the above

Blood protein is:

1. Albumin

2. Haemoglobin

3. Both (1) and (2)

4. None of the above

The destruction of the biological nature and activity of proteins by heat or chemical agent is called :-

Enzyme trypsin converts:

1. amino acids into proteins

2. glucose into glycogens

3. starch into sugar

4. proteins into amino acids

Kwashiorkor is caused by the deficiency of?

1. vitamins

2. hormones

3. Carbohydrate

4. essential amino acids

Which is fat soluble vitamin?

(1) Vitamin A

(2) Pyridoxine

(3) Riboflavin

(4) Thiamine

Which vitamin contains N ?

(1) Vitamin A

(2) Vitamin C

(3) Vitamin B

(4) Vitamin D