Q. No.
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
(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 of the following is not a polymeric substance?
(1) Rubber
(2) Morphine
(3) Gum
(4) Cellulose
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. 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
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
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 |
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