- 1(current)
Q. No.Find the correct statement
1. Catalysed reactions proceed at rates higher than that of uncatalysed ones.
2. In skeletal muscle under anaerobic conditions lactic acid is formed from pyruvic acid.
3. In yeast during fermentation ethanol is formed from pyruvic acid.
4. All of these
Which of the following is true about carbonic anhydrase?
1. It accelerates the rate of formation of carbonic acid by 10 million times.
2. In its absence only 200 molecules of carbonic acid is formed in an hour.
3. It forms 600,000 molecules of carbonic acid in one second.
4. All of these
Which of the following is true?
1.The conversion of acetic acid to cholesterol is an anabolic process.
2.The conversion of glucose to lactic acid is a catabolic process.
3.The conversion of acetic acid to cholesterol is a bio-synthetic pathway
4.All of these
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 describes the given graph correctly?
1. Endothermic reaction with energy A in presence of enzyme and B in absence of enzyme
2. Exothermic reaction with energy A in presence of enzyme and B in absence of enzyme
3. Endothermic reaction with energy A in absence of enzyme and B in presence of enzyme
4. Exothermic reaction with energy A in absence of enzyme and B in presence of enzyme
CO2 dissolving in water is a
1.Physical process
2.Catalysed process in living system
3.Chemical process
4.both 1 and 2
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
Three of the following statements about enzymes are correct and one is wrong. Which one is wrong?
| 1. | Enzymes are denatured at high temperatures but in certain exceptional organisms they are effective even at temperatures 80º - 90ºC |
| 2. | Enzymes are highly specific |
| 3. | Most enzymes are proteins but some are lipids |
| 4. | Enzymes require optimum pH for maximal activity |
- 1(current)
Q. No.
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