Q. No.Which statement regarding enzyme inhibition is correct?
1. Competitive inhibition occurs when a substrate competes with enzyme for binding to inhibitor protein
2. Competitive inhibition occurs when a substrate and the inhibitor compete for active site on the enzyme
3. Non-competitive inhibition of an enzyme can be overcome by adding a large amount of substrate
4. Non-competitive inhibitors often bind to the enzyme irreversibly
1. Competitive inhibition occurs when a substrate competes with enzyme for binding to inhibitor protein
2. Competitive inhibition occurs when a substrate and the inhibitor compete for active site on the enzyme
3. Non-competitive inhibition of an enzyme can be overcome by adding a large amount of substrate
4. Non-competitive inhibitors often bind to the enzyme irreversibly
Cell membrane carbohydrates participate in
1. transporting substances between two protein layers
2. cell-to-cell recognition
3. attaching the membrane to cytoskeleton
4. cell adhesions
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) |
A molecule of ATP is structurally most similar to :
1. RNA nucleotide
2. DNA nucleotide
3. amino acid
4. fatty acid
In feedback inhibition, a metabolic pathway is switched off by:
1. a rise in temperature
2. lack of a substrate
3. accumulation of the end product
4. competitive inhibition
The unique properties of each amino acid is determined by its particular :
1. R group
2. amino group
3. kinds of peptide bonds
4. number of bonds to other amino acids
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
The ion required as the co-factor for the proteolytic enzyme, carboxypeptidase, is:
1. Zinc
2. Copper
3. Iron
4. Manganese
The inhibition of succinic dehydrogenase by malonate is an example of:
1. Non-competitive reversible inhibition
2. Non-competitive irreversible inhibition
3. Competitive inhibition
4. Allosteric inhibition
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