doc exam questions

doc exam questions with correct
answers

For an enzyme-catalysed reaction which of the following

statements is FALSE?

a) The enzyme is used up as the reaction proceeds

b) The substrate is used up as the reaction proceeds

c) The reaction reaches the same equilibrium as the uncatalyzed

reaction

d) The enzyme is capable of binding the product of the reaction

e) Most enzymes can catalyse the reverse reaction<correct

answers>a) The enzyme is used up as the reaction proceeds



Which of the following statements about the active site of an

enzyme is FALSE?

a) It is derived from the 3D arrangement of amino acid residues

b) It often exploits the chemical properties of just three specific

residues

c) It remains rigid and does not change shape

d) It can contain a metal ion, such as magnesium

, e) It contains both binding and catalytic pockets<correct

answers>c) It remains rigid and does not change shape



S-Adenosyl methionine (SAM) is a molecule utilised in various

metabolic pathways to transfer methyl groups from SAM to an

acceptor. What is the proper designation of the complex of SAM

and its enzyme together?

a) Coenzyme

b) Zymogen

c) Holoenzyme

d) Cofactor

e) Proenzyme<correct answers>e) holoenzyme



One group of enzymes catalyses the exchange of an amino group

(NH2) from an amino acid to an a-keto acid. Which category of

enzyme do they best fit?

a) Hydrolase

b) Lyase

c) Oxidoreductase

d) Ligase