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Question 1The rate of removal of alcohol from the bloodstream stays the same, regardless of the concentration of blood alcohol. What term do we use to describe this reaction? a) A zeroth order reaction b) A first order reaction c) A second order reaction Question 2The concentration of a reactant is measured at two time intervals as a reaction proceeds. At the first time interval, the concentration of the reactant is 0.5 mol L-1; 20 seconds later, the concentration is 0.45 mol L-1. At what rate is the reactant being consumed? a) 0.0225 mol L-1 s-1 b) 0.0025 mol L-1 s-1 c) 0.05 mol L-1 s-1 d) 0.025 mol L-1 s-1 Question 3A spontaneous reaction doesn't have an activation energy. True or false? a) True b) False Question 4Look at the following diagram, which depicts the energy diagram for a chemical
reaction. Which point on the diagram represents the point at which the transition state exists?  a) A b) B c) C d) D Question 5Which of the following statements regarding the use of catalysts is false? a) Catalysts lower the activation energy for a reaction b) Catalysts increase the proportion of molecules that possess sufficient energy to clear the activation energy barrier c) Catalysts increase the number of reactions that can happen spontaneously d) Catalysts provide an alternative reaction pathway from reactant to product Question 6Enzyme-catalysed reactions do not involve a transition state. True or false? a) True b) False Question 7Which one of the following statements regarding Vmax and KM is false? a) Vmax is the maximum rate at which a particular enzyme-catalysed reaction can proceed. b) KM is the concentration of substrate at which the rate of the reaction reaches Vmax c) A small value of KM tells us that an enzyme binds strongly to its substrate d) A large value of KM tells us that an enzyme shows little specificity for a given substrate Question 8Which of the following statements regarding enzymes is false? a) A given enzyme catalyses just one type of reaction b) While most enzymes are proteins, some are composed of RNA c) The activity of enzymes is typically impaired at high temperatures d) Enzymes act to lower the activation energy of a reaction by stabilising the transition state, but do not participate chemically in the reaction Question 9Which of the following is not the name of a graph used to experimentally determine the values of KM and Vmax? a) Michaelis-Menten b) Lineweaver-Burk c) Hanes Question 10A reversible inhibitor is found to increase the KM for a reaction but has no effect on Vmax. To which class of reversible inhibitor does it belong? a) Noncompetitive b) Competitive c) Uncompetitive Which of the statement regarding enzyme is false?An enzyme allows the reaction to go through a more stable transition state than would normally be the case. An enzyme provides an alternate pathway having lower activation energy. The statement (C) is false with respect to an enzyme's ability to catalyses a reaction.
Which of the following statements is true about enzymes?Answer and Explanation:
The correct answer is (b) Enzymes can require vitamin or mineral cofactors for their function. Enzymes are proteins that function to catalyze chemical reactions in living organisms.
Which of the following is true about enzyme Mcq?This statement about enzymes is true: Enzymes accelerate reactions by lowering the activation energy. Enzymes are proteins whose three-dimensional form is key to their function. Enzymes do not alter the overall change in free energy for a reaction.
Which statement regarding pH and enzyme function is false?Enzyme structure can be compromised if the pH is either too low or too high this is also false statement because enzyme denatured at high pH and temperature and does not work efficiently below its optimum pH and temperature. Hence, enzyme structure cannot be compromised if pH is either too low or too high.
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Which of the following statement regarding enzymes is false?
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