The couplings between base units of DNA is through : 

1.	Hydrogen bonding	2.	Electrostatic bonding
3.	Covalent bonding	4.	Van der waal's forces

RNA and DNA are chiral molecules, their chirality is due to

1. L-sugar component

2. chiral bases

3. chiral phosphate ester units

4. D-sugar-component

The correct option about the presence of  H-bond in nucleotides is: 

1. A-T, G-C

2. A-G, T-C

3. G-T, A-C

4. A-A, T-T

Glycolysis is

1. oxidation of glucose to pyruvate

2. conversion of glucose to haem

3. oxidation of glucose to glutamate

4. conversion of pyruvate to citrate

Which is not a true statement?

1. a-carbon of a-amino acid is asymmetric except glycine

2. All proteins are found in L-form

3. Human body can synthesis all proteins they need

4. At pH = 7 both amino and carboxylic groups exist in ionised form

The human body does not produce

1. DNA

2. vitamins

3. hormones

4. enzymes

An amine among the following that acts as hormone is : 

1. Thyroxine

2. Oxypurin

3. Insulin

4. Progesterone

a-D-(+)-glucose and b-D-(+)-glucose are

Which of the following is the sweetest sugar?

1. Sucrose

2. Glucose

3. Fructose

4. Maltose

Compound that gives positive Fehling's solution test is : 

1. Sucrose

2. Glucose

3. Fat

4. Protein