Biomolecules Assertion Reason Based Questions

The following questions consist of two statements, one labelled as Assertion (A) and the other labelled the Reason ®. Examine these two statements carefully and select the most appropriate answer codes.
A. Assertion and reason both are correct and reason is the correct explanation of Assertion.
B. Assertion and reason both are correct and reason is not the correct explanation of Assertion.
C. Assertion is correct but reason is wrong.
D. Both Assertion and Reason are false.

1. Assertion: ATP molecules are energy rich molecules.
   Reason: ATP consist of a purine base adenine, pentose sugar ribose and a string of three phosphate groups.
2. Assertion: Catabolism is a biosynthetic process
   Reason: Catabolism produces simpler molecules from complex one.
3. Assertion: Amino acids are amphoteric in their function.
   Reason: All amino acids are necessary for our body.
4. Assertion: The substrate binds to the active site of the enzyme.
   Reason: The binding of substrate induces the enzyme to alter its shape.
5. Assertion: A co-enzyme Or metal ion that is very toughly bound to enzyme protein is called prosthetic group.
   Reason: A complete, catalytically active enzyme together with its bound prosthetic group is called apoenzyme.
6. Assertion: Enzyme lower the activation energy.
   Reason: Activation energy decreases the kinetic energy of the system.
7. Assertion: Enzymes are proteins which catalyse biochemical reaction.
   Reason: The enzymes itself unchanged in the reaction, it’s presence allows the reaction to take place.
8. Assertion: DNA is negatively charged molecule.
   Reason: DNA contains ribose sugar.
9. Assertion: Arachidic acid is an unsaturated fatty acid.
   Reason: There are present one or more double bonds between carbon atoms in unsaturated fatty acids.
10. Assertion: NAD and NADP are coenzymes.
    Reason: NAD and NADP contains the vitamin niacin.
11. Assertion: Activity of an enzyme is pH dependent.
    Reason: Change in pH affects the solubility of the enzyme in water.
12. Assertion: Fats can be converted to carbohydrates.
    Reason: Fats are stored in oil seeds.
13. Assertion: Co- enzyme is a nonprotein group without which enzymes are inactive or incomplete.
    Reason: Co-enzymes not only provide a point of attachment for the chemical group being transformed but also influence the properties of the group.
14. Assertion: Unsaturated fats lower blood cholesterol.
    Reason: Unsaturated fats have lower melting point.
15. Assertion: Sucrose is a now reducing sugar.
    Reason: In a sucrose molecule, aldose group of glucose and ketose group of fructose are lost due to formation of glycosidic bond between them in a sucrose molecule.

Answer Sheet

1. B
2. D
3. B
4. A
5. C
6. C
7. B
8. C
9. C
10. B
11. A
12. B
13. A
14. B
15. A