CHAPTER 1 : MOLECULE OF LIFE

1. What is the bond that join/attract a water molecule to another water molecules ?

• hydrogen bond

• covalent bond

• disulphide bridge

• surface tension

2. Lakes only freeze on the surface because

• water has high surface tension

• water can act as solvent

• water has low viscosity

• ice is less dense than water

3. Which of the following is true about maltose and amylose?

• both monomers are ß-glucose

• both are polysaccharides

• both are disaccharides

• both contain monomers α-glucose

4. How many glycerol and fatty acid molecules are present in a triglyceride molecule?

• 3 glycerol and 1 fatty acid

• 3 glycerol and 3 fatty acids

• 1 glycerol and 3 fatty acids

• 1 glycerol and 1 fatty acid

5. Structure of a fatty acid that consists both hydrophobic region and hydrophilic region known as

• amphipathic

• acidic

• basic

• amphoteric

6. How do amino acids are classified into four groups?

• based on their amino group

• based on their carboxyl group

• based on the numbers of carbon

• based on their side chain

7. Property of amino acid that consists an amino group and a carboxyl group known as

• acidic

• basic

• amphoteric

• amphipathic

8. Pentose sugar of RNA is

• ribose

• deoxyribose

• glucose

• fructose

9. Properties of water include i. High surface tension ii. High specific heat capacity iii. High viscosity

• I and II

• I and III

• II and III

• I, II and III

10. What molecule form when 2 amino acids undergo condensation?

• maltose

• dipeptide

• sucrose

• pentose