Q. No.Consider the given two statements:
I. Starch turns into an intense "blue-black" colour upon addition of aqueous solutions of the triiodide anion
II. Starch does not form secondary helical structures
1. Both I and II are correct and II explains I
2. Both I and II are correct but II does not explain I
3. I is correct but II is incorrect
4. Both I and II are incorrect
I. Starch turns into an intense "blue-black" colour upon addition of aqueous solutions of the triiodide anion
II. Starch does not form secondary helical structures
2. Both I and II are correct but II does not explain I
3. I is correct but II is incorrect
4. Both I and II are incorrect
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All the following are examples of competitive enzyme inhibition except:
1. Sulfa drugs used as antibacterial agents
2. Ethyl alcohol used in methyl alcohol poisoning
3. Malonate inhibiting succinic dehydrogenase enzyme
4. Glucose 6 phosphate inhibiting hexokinase in brain
Macromolecules and polymers synthesized by ‘dehydration synthesis’ include all the following except:
| 1. | Fats | 2. | Carbohydrates |
| 3. | Proteins | 4. | Nucleic acids |
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Which of the following is not an example of dehydration synthesis in the structure of a biomolecule?
1. linking of individual monosaccharides in a polysaccharide
2. nitrogenous base pairing in a double stranded DNA helix
3. synthesis of triglycerides from fatty acids and glycerol
4. formation of the primary structure of a polypeptide
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Enzymes are biochemical catalysts that:
1. can change the equilibrium position of the reaction it catalyses by lowering the energy of activation of that reaction.
2. can lower the energy of activation of the reaction it catalyses by increasing the molecular collisions between the molecules.
3. lower the free energy difference between substrate(s) and product(s) but it cannot change the equilibrium position of the reaction it catalyses.
4. cannot change the equilibrium position of the reaction it catalyses but it lowers the energy of activation of that reaction.
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In competitive inhibition, if the concentration of the substrate is increased :
1. the rate of the reaction is increased
2. the rate of the reaction is decreased
3. the rate of the reaction is not affected
4. the reaction direction is reversed
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Carbohydrates are commonly found as starch in plant storage organs. Which of the following five properties of starch (a-e) make it useful as a storage material?
(i). easily translocated
(ii). chemically non-reactive
(iii). easily digested by animals
(iv). osmotically inactive
(v). synthesized during photosynthesis
The useful properties are:
| 1. | (i), (ii) and (v) | 2. | (i) and (v) |
| 3. | (ii) and (iii) | 4. | (ii) and (iv) |
Why is cellulose so difficult for most animals to digest?
1. they don’t have the proper enzyme to break the bonds between subunits
2. cellulose is made up of chitin, which is indigestible
3. the bonds holding cellulose subunits together are extremely strong, stronger than in any other macromolecule
4. there are many hydrogen bonds holding the subunits together
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