The couplings between base units of DNA is through

(1) Hydrogen bonding

(2) Electrostatic bonding

(3) Covalent bonding

(4) Van der waal's forces

An example of biopolymer is

(1) Teflon

(2) neoprene

(3) nylon-66

(4) DNA

Among the following non-reducing sugar is :

(1) Glucose

(2) Fructose

(3) Sucrose

(4) Galactose

When glucose is reacted with phenylhydrazine then osazone is formed. In this reaction how many phenyl hydrazine molecules are used?

1. 1

2. 2

3. 3

4. 4

Sucrose on treatement with conc. HCl produces:-

(1) Glucose

(2) Fructose

(3) Glucose + Fructose

(4) Maltose

Which type of amino acid is lysine ?

1. b - Amino acid

2. Acidic

3. Basic

4. Neutral

The above process in which a and b form remain in equilibrium with acyclic form and a change in optical rotation is observed which is called as–

(1) Mutarotation

(2) Epimerisation

(3) Condensation

(4) Inversion

At iso-electric point:

(a) conc. of cation is equal to conc of anion

(b) Net charge is zero.

(c) Maximum conc. of di-polar ion (Zwitterion) will be present

(d) All of the above

Which amino acid does not contain chiral centre ?
(1) Valine
(2) Leucine
(3) Glycine
(4) Iso-leucine

Which of the following pair gives same phenyl osazone ?

(a) D-Glucose and D-Allose
(b) D-Glucose and D-Alfrose
(c) D-Glucose and D-Mannose
(d) D-Glucose and D-Talose