Adult human haemoglobin consists of:

(1) 2 subunits (β, β)                           

(2) 2 subunits (α, α)

(3) 4 subunits (2α, 2β)                      

(4) 3 subunits (2α, 1β)

Which one is false?
(1) Fatty acids may be unsaturated (with one or more C = C bonds) or a saturated (without double bonds)

(2) Fatty acid(s) may be esterified with glycerol forming monoglyceride, diglyceride and then triglyceride

(3) Some tissues especially neural tissues have lipids with very simple structures

(4) Fats and oils are triglycerides

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

Which one of the following is the diagrammatic representation of a nucleotide?

(a)  (b)       (c)     (d)

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

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

Which of the following statements about enzymes is true?

(1) All are correct 

(2) All except 5     

(3) 5 and 6         

(4) 2 and 4

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

Which one of the graphs shows the effect of pH on the velocity of a typical enzymatic reaction (V)?

1.     2.     3.      4.

Which one of the graphs show the effect of temperature on the velocity of a typical enzymatic reaction?