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Quiz 18
Mdcat-past-papers - ETEA Quiz
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Board: ETEA |
341. When substrate combines the active site of an enzyme it induces a conformation change that enable enzyme it to perform:
Analytic function
Metabolism
Meiosis
Mitosis
342. Which of the following is an example of hydrolase.
Transmethylase
Oxygenases
Peroxidase
Phosphatase
343. Lock and key model for enzyme action proposed by Emil Fischer suggests that:
enzymes are unbiased for substrate
Enzymes can modify their active site
Enzymes are restricted to one reaction
An enzyme can catalyze variety of reaction
344. Enzyme works by lowering the ___ of the reaction they catalyze:
Kinetic energy
Activation energy
Heat energy
Potential energy
345. Coenzyme requires:
Vitamins
Proteins
Fats
Carbohydrates
346. Enzymes increase the rate of reaction by:
Increasing temperature
Decreasing pH
Decreasing activation energy
Increasing activation energy
347. At equilibrium, a scientist added more substrate and observed and increase in the rate of the reaction which soon declined. He added some more substrate but this time the rate of the reaction remain unaffected. What was the reason
Enzyme did not function
Feedback due to accumulatioin of the end product
Enzyme was more than substrates active site
substrate did not functon
348. Most enzymes have an optimum temperature of around
30
40
50
20
349. What is "Flavin adenine dinucleotide"?
Catalyst
Coenzyme
Cofactor
Enzyme
350. The enzymes enable the conversion of substrates into products by:
Changing equilibrium in the direction of the substrate
Increasing the activation energy
Increasing the substrate concentration
Lowering the activation energy
351. Most enzymes have optimum temperature of around:
30°C
40°C
50°C
20°C
352. At temperature higher than optimum, enzyme activity decreases due to:
Saturation
Denaturation
Composition
inhibition
353. Considering enzyme action minimum temperature is the term used when:
Enzymes start denaturing
enzyme work at their best
enzymes become hyperactive
inactive enzyme getting reactivated
354. Enzyme succinate dehydrogenase converts succinate into:
Malate
Malonic acid
Citrate
Fumarate
355. Which of following is an example of competitive inhibitors:
Glucose
Fumarate
Succinic acid
Malonate
356. If inhibitor bind to another site of enzyme rather than the active site then it is referred as:
Competitive Inhibitor
NonCompetitive Inhibitor
Irreversible
Allosteric
357. Competitive inhibitors compete with?
Enzyme
Substrate
Product
Coenzyme
358. They are inhibitors of key enzymes in the nervous system
Calcium and Potassium
Hexokinase and glucose
Substrate and activators
Magnesium and manganese
359. The structure of an enzyme is altered by:
Irreversible inhibition
Reversible inhibition
Competitive inhibition
Non competitive inhibition
360. Chemical substance that can react with an enzyme faster than real substance and without producing a product is:
Accelerator
Inhibitor
Co-enzyme
Activator
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