BIOMOLECULES
Q. 1. Name polysaccharides which is stored in the liver of animals.
Ans. Glycogen.
Q. 2. What structural feature is required for a carbohydrate to behave as reducing sugar ?
Ans. The carbonyl group of any one monosaccharide present in carbohydrate should be free.
Q. 5. Why is sucrose called invert sugar ?
Ans. When sucrose is hydrolysed by water, the optical rotation of solution changes from positive to negative.
Q. 6. Name the amino acid which is not optically active.
Ans. Glycine.
Q. 12. Give the Howarth projection of D-glucopyranose.
Ans 
Q. 25. Why are carbohydrates generally optically active ?
Ans. Because they contain one or more chiral atom.
Q. 32. Amino acids are amphoteric in nature. Explain.
Ans. It can react with acid and base both as per the following reaction :
Q. 15. Write the products of oxidation of glucose with :
- Bromine water
- Nitric acid
Q. 19. What are essential and non-essential amino acid ? Give two examples of each type.
Ans. Essential amino acids are those which are not produced in our body and required to be supplied from outside, e.g., valine, leucine.
Non-essential amino acids are those which are produced by our body, e.g., glycine, alanine.
Q. 20. Give reasons :
- On electrolysis in acidic solution amino acids migrate towards cathode while in alkaline solution these migrate towards anode.
- The monoamino monocarboxylic acids have two pk values.
Ans (i) 
(ii) Due to zwitter ion formation.