Enzymes
Quiz by Hazlina Zakeri
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20 questions
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- Q1Enzymes influence chemical reactions in living systems byaffecting the rate at which reactions occurcombining with excess hydrogen to form gaseous wastesproviding the substrate required for the reaction to occurabsorbing water released when polymers are formed30s
- Q2The "lock and key hypothesis" attempts to explain the mechanism ofsharing of electronspinocytosisvacuole formationenzyme specificity30s
- Q3An enzyme that hydrolyzes protein will not act upon starch. This fact is an indication that enzymes arespecificcatalyticeffectivehydrolytic30s
- Q4At high temperatures, the rate of enzyme action decreases because the increased heatalters the active site of the enzymeneutralizes the acids and bases in the systemchanges the pH of the systemincreases the concentration of the enzyme30s
- Q5Vitamins are essential to the survival of organisms because vitamins usually function assubtratescoenzymesnucleic acidsnucleotides30s
- Q6Which chemical is classified as an enzyme?galactosemanganese dioxideproteaselipid30s
- Q7Salivary amylase is an enzyme in humans that breaks down starch. The optimum pH for this reaction is 6.7. The rate of this reaction would not be affected bysubstrate concentrationdecreasing the temperature of the reaction by 5 degrees Cmaintaining the pH of the reaction at 6.7enzyme concentration30s
- Q8The effect of temperature on the relative rate of action of an enzyme is represented in the graph. The optimum temperature for the action of this enzyme is approximately15 degree Celcius22 degree Celcius37 degree Celcius50 degree Celcius30s
- Q9The diagram represents three steps in the hydrolysis of a molecule of sucrose. In this diagram, structure X is most likelyan organic catalysta molecule of oxygenthe substratethe end product30s
- Q10Which statement best describes the enzyme represented in the graphs below?This enzyme works best at a temperature above 50 C and a pH above 12This enzyme works best at a temperature of 50 C and a pH of 12.Temperature and pH have no influence on the activity of this enzyme.This enzyme works best at a temperature of 35 C and a pH of 8.30s
- Q11What happens to an enzyme when it is denatured?Activation energy is raisedIt can catalyze more reactionsActivation energy is loweredIt loses its shape30s
- Q12The catalytic efficiency of of two different enzymes can be compared by themolecular size of enzymesKm valuepH of optimum valueformation of product30s
- Q13An enzyme inhibitor increases the Km value of the enzyme BUT do not affect the Vmax. This type of inhibitor isnoncompetitivecompetitiveincompetitiveuncompetitive30s
- Q14The value of Vmax for the enzyme depicted by curve A is10 µmol min-1 mg-1.0.5 µM.0.1 µmol min-1 mg-1.1 µmol min-1 mg-1.30s
- Q15Curve C depicts the effect of an inhibitor of the system described by curve A. This inhibitoris a competitive inhibitor.increases the Vmax.decreases the Km.is a noncompetitive inhibitor.30s
