Q. No.A competitive inhibitor of succinic dehydrogenase is:
1. malonate 2. oxaloacetate 3. α-ketoglutarate 4. malate
An organic substance bound to an enzyme and essential for its activity is called:
1. coenzyme
2. holoenzyme
3. apoenzyme
4. isoemzyme
Consider the following statements:
| A: | A coenzyme or metal ion that is tightly bound to enzyme protein is called prosthetic group |
| B: | A complete catalytic enzyme with its bound prosthetic group is called apoenzyme |
Select the correct option
1. (A) is false but (B) is true
2. Both (A) and (B) are true
3. (A) is true but (B) is false
4. Both (A) and (B) are false
The curve given below shows enzymatic activity with relation to three conditions (pH, temperature and substrate concentration) what do the two axis (X and Y) represent?
|
X-axis |
Y-axis |
|
|
(a) |
Temperature |
Enzyme activity |
|
(b) |
Substrate concentration |
Enzyme activity |
|
(c) |
Enzyme activity |
Temperature |
|
(d) |
Enzyme activity |
pH |
1. (a)
2. (b)
3. (c)
4. (d)
Which one of the following structural formulae of two organic compounds are correctly identified along with its related function?
1. A- Triglyceride – a major source of energy
2. B- Uracil – a component of DNA
3. A- Lecithin – a component of cell membrane
4. B- Adenine – a nucleotide that makes up nucleic acids
Which one is the most abundant protein in the animal world?
1. Trypsin
2. Haemoglobin
3. Collagen
4. Insulin
Given below is the diagrammatic representation of one of the categories of small molecular weight organic compounds in the living tissues. Identify the category shown and the one blank component X in it:
| 1. | Category: Cholesterol; Component: Guanine |
| 2. | Category: Amino acid; Component: NH2 |
| 3. | Category: Nucleotide; Component: Adenine |
| 4. | Category: Nucleoside; Component: Uracil |
Transition state structure of the substrate formed during an enzymatic reaction is:
1. permanent but unstable
2. transient and unstable
3. permanent and stable
4. transient but stable
The essential chemical components of many coenzymes are:
1. Nucleic acid
2. Carbohydrates
3. Vitamins
4. Proteins
Select the option which is not correct with respect to enzyme action:
| 1. | Substrate binds with the enzyme at its active site. |
| 2. | Addition of a lot of succinate does not reverse the inhibition of succinic dehydrogenase by malonate |
| 3. | A non-competitive inhibitor binds the enzyme at a site distinct from that which binds the substrate |
| 4. | Malonate is a competitive inhibitor of succinic dehydrogenase |
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