1. How are hemicelluloses recovered?
a) Centrifugation
b) Electrophoresis
c) Electrolysis
d) Thermal diffusion
Explanation: Electrophoresis is used in recovering of hemicelluloses.
2. What field is applied in fled-flow fractionation?
a) Thermal gradient
b) Centrifugal force field
c) Perpendicular electric or magnetic field
d) Parallel electric or magnetic field
Explanation: A perpendicular electric or magnetic field is applied to the laminar flow.
3. What do the cation and anion permeable membrane do in electro-dialysis?
a) Disallows migration of species of same charge
b) Facilitates the migration of species of same charge
c) Separates the protons and electrons
d) Removes the ions
Explanation: A cation or anion membrane carries a fixed charge that prevents the migration of species of same charge.
4. What happens when a temperature gradient is applied?
a) Components flow at different rates
b) Charged components migrate to opposite sides
c) The high melting component melts
d) Concentration gradient is formed
Explanation: A concentration gradient is formed due to temperature that gives the separation using thermal diffusion.
5. What is the role of centrifugal force field?
a) Establishes a magnetic field
b) Establishes a pressure filed
c) Establishes an electric field
d) Settles down the heavier particles
Explanation: The centrifugal filed establishes a pressure field that separates fluid mixtures according to molecular weights.
6. Why is an external field or gradient applied?
a) To increase the speed of separation
b) To start the separation
c) To decrease the byproducts
d) To obtain maximum efficiency
Explanation: The external field is not employed to increase efficiency or speed but it is the driving force in the separation
7. Which of the following is not a classification of biological species?
a) Bio-molecules
b) Small molecules
c) Bio-Polymers
d) Cellular particulates
Explanation: Bio-molecules are fats, carbohydrates, proteins etc. They are not species.
8. What are primary metabolites?
a) Synthesized during primary phase of cell growth
b) Synthesized during secondary phase of cell growth
c) Synthesized during death phase of cell growth
d) Synthesized during growth phase of cell
Explanation: Primary metabolites include the amino acids and the disaccharides and vitamins that are synthesized during primary phase of cell growth.
9. What are secondary metabolites?
a) Synthesized during primary phase of cell growth
b) Synthesized during secondary phase of cell growth
c) Synthesized during the stationary phase
d) Synthesized during growth phase of cell
Explanation: Secondary metabolites include steroids, cytoxins etc. which are synthesized during stationary phase of a cell.
10. What is the molecular weight range of proteins?
a) 1000 DA- 10000 DA
b) 10000 Da- 100000 Da
c) 100000 Da-1000000 Da
d) 100000Da – 10000000 Da
Explanation: The size of a protein molecule is 10000 Da to 100000 Da.