Lecithin is:

(1) Phospholipid   

(2) Carbohydrate  

(3) Protein            

(4) Amino acid

Subtopic:  Lipids: Glycerolipids, Phospholipids & Glycerol |
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The above diagram represent the nitrogenous bases. Identify the correct combination:

(1) A = Adenine; B = Thymine          

(2) A = Guanine; B = Thymine

(3) A = Adenine; B = Uracil               

(4) A = Guanine; B = Uracil

Subtopic:  Double Helix : Watson & Crick Part 1 | Double Helix : Watson & Crick |
 76%
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Which one of the following is the diagrammatic representation of a nucleotide?

(a)  (b)       (c)     (d)

Subtopic:  Double Helix : Watson & Crick Part 1 | Double Helix : Watson & Crick |
 83%
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Go through the following statements-
A. Primary metabolites are biochemicals formed as intermediates and products of normal vital metabolic pathways of organisms
B. Plant tissues produce only secondary metabolites
C. Secondary metabolites have restricted distribution in the plant kingdoms only.
D. Secondary metabolites are derivatives of primary metabolites.
E. Many plants, fungi and microbes synthesise secondary metabolites.
F. No secondary metabolite has ecological importance.
G. We understand the role of all secondary metabolites in the host organisms.
H. Many secondary metabolites are of economic importance to us.
Which of the above statement are wrong?
(1) A, B, C are wrong                               

(2) D, E, F are wrong

(3) A, D, E are wrong                               

(4) B, C, F, G are wrong

Subtopic:  Primary & Secondary Metabolites |
 72%
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Which one of the following is not a polymeric substance?

(1) Rubber            

(2) Morphine                  

(3) Gum               

(4) Cellulose

 75%
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Which one is heteropolymer?

(1) Chitin

(2) Polyethylene

(3) Peptidoglycan

(4) Inulin

Subtopic:  Introduction to Proteins |
 58%
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Which one is correct?
(1) Inorganic catalysts work efficiently at high temperature and high pressure while enzymes get damaged at high temperature (above 40°C)

(2) Thermophilic organisms living in hot vents and sulphur springs have enzymes that are stable and retain their catalytic power even at high temperature (80 - 90°C)

(3) Ribozymes are nucleic acids behaving like enzyme

(4) All are correct

Subtopic:  Enzyme Introduction |
 93%
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Which of the following statements about enzymes is true?

1. Enzymes do not alter the overall change in free energy for a reaction

2. Enzymes are proteins whose three dimensional shape is key to their functions

3. Enzymes speed up reactions by lowering activation energy

4. Enzyme are highly specific for reactions

5. An enzyme like any protein has the secondary and tertiary structure.

6. The energy input needed to start a chemical reaction is called activation energy

(1) All are correct 

(2) All except 5     

(3) 5 and 6         

(4) 2 and 4

Subtopic:  Enzyme Introduction |
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Activation energy:
(1) Is the difference in the average energy content of 'S' from that of its transition state

(2) Helps to change reactants into unstable transition state before they can be converted into products

(3) Is minimum energy required from outside to overcome the energy barrier of reactant or to start a reaction

(4) All are correct

Subtopic:  Mechanism of Enzymes |
 84%
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   I. Segment representing the energy of activation.

   II. Segment representing the amount of free energy released by the reaction.

   III. Transition state

   IV. Segment would be the same regardless of whether the reaction were uncatalysed or catalysed

Which one is correct?

 

I

II

III

IV

(a)

1

3

2

4

(b)

1

2

3

2

(c)

1

3

2

4

(d)

1

2

4

3

Subtopic:  Mechanism of Enzymes |
 81%
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