Biology_Today_-_October_2016



     


 




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4. Which saccharide is referred as animal starch? Name the
   type of linkages present in it.


5. Draw the structure of cholesterol.

ANSWER KEY

New MCQs

1. (b) 2. (c) 3. (a) 4. (d) 5. (b)


2. (c) 7. (c) 8. (b) 9. (d) 10. (a)


3. (b) 12. (a) 13. (d) 14. (b) 15. (b)


4. (b) 17. (a) 18. (d) 19. (c) 20. (c)

Exam Section

1. (d) 2. (b) 3. (b) 4. (c) 5. (d)


2. (c) 7. (b) 8. (b) 9. (b) 10. (b)


3. (c) 12. (a) 13. (a) 14. (a) 15. (a)


4. (d) 17. (c) 18. (a) 19. (a) 20. (a)

Assertion & Reason

1. (d) 2. (c) 3. (a) 4. (a) 5. (a)

Short Answer Type Questions

1. (a) RuBisCo (b) Phrenoderma
   (c) Reducing (d) Pentoses, hexoses


2. Some of the important functions of lipids are as follows:
   (i) Fats serve as food reserve in both plants and animals.
   (ii) Fats can be converted to carbohydrates.
   (iii) Vitamin A, D, E and K are soluble in fats.
   (iv) In seeds and spores lipids help in thermal insulation,
   protection from harmful UV radiations and loss of water.
   3. Differences between Purine and Pyrimidine
   Purine Pyrimidine
   (i) Purines are larger-sized
   nitrogen containing
   biomolecules.

Pyrimidines are smaller-

sized nitrogen containing

biomolecules.

(ii) A purine is nine-

membered.

A pyrimidine is

6-membered.

(iii) It is a double ring. It is a single ring.

(iv) A purine contains four

nitrogen atoms at 1, 3,

7 and 9 positions.

A pyrimidine has nitrogen

atoms at two places, 1

and 3 positions.

(iv) Purine bases are of two

types, adenine (A) and

guanine (G).

Pyrimidine bases are of

three types—cytosine (C),

thymine (T) and uracil (U).

4. Glycogen is popularly known as animal starch. There are two
   types of linkages: 1-4 α-linkages in the straight chain and
   1-6 linkages in the area of branching.


5. Diagrammatic structure of cholesterol is as follows:

