Answer the following questions and then press 'Submit' to get your score.
Question 1
The 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 2
The 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 3
A spontaneous reaction doesn't have an activation energy. True or false?
a) True
b) False
Question 4
Look 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 5
Which 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 6
Enzyme-catalysed reactions do not involve a transition state. True or false?
a) True
b) False
Question 7
Which 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 8
Which 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 9
Which 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 10
A 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