Microbiology 020 - General Microbiology » Fall 2021 » Microbial Metabolism 2

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Question #1
Many coenzymes are formed from ______.
A.   substrates
B.   proteins
C.   vitamins
D.   metals
Question #2
Energy is carried from catabolic to anabolic reactions in the form of _______.
A.   inorganic phosphate
B.   coenzymes
C.   high-energy ATP bonds
D.   ADP
Question #3
Enzymes that can be shut down or activated based on the presence of chemicals in their environment are called ________.
A.   repressed
B.   regulated
C.   constitutive
D.   holoenzymes
Question #4
Enzymes are ________.
A.   nucleic acids
B.   proteins
C.   steroids
D.   lipids
Question #5
Which of the following binds to the active site of an enzyme?
A.   Product
B.   Water
C.   Any other enzyme
D.   None of the choices are correct.
E.   Substrate
Question #6
Which of the following correctly represents the mechanism of enzyme function, where S is "substrate" and E is "enzyme" and P is "product"?
A.   E + S -> E-P -> E-S -> E + S
B.   E + P -> E-P -> E-S -> E + S
C.   E + S -> E-S -> E-P -> E + P
D.   E + P -> E-S -> E-P -> E + P
E.   S + P -> E-P -> E + P
Question #7
Which of the following statement(s) about biochemical pathways is(are) TRUE?
A.   They are very well organized and structured
B.   They convert an initial substrate via a series of steps into an end product
C.   They are very well organized and structured, they convert an initial substrate via a series of steps into an end product, and they can only function for a few runs
D.   They are very well organized and structured and they convert an initial substrate via a series of steps into an end product
E.   They can only function for a few runs
Question #8
Consider the biochemical pathway: A – E1 –> B – E2 –> C Enzyme 1 can utilize ________.
A.   only A as substrate
B.   either A or B as substrate, but not both
C.   only B as substrate
D.   both A and B as substrates
E.   neither A nor B as substrate
Question #9
Consider the biochemical pathway: A – E1 –> B – E2 –> C If Enzyme 2 is inactive, which of the following compounds will accumulate?
A.   B and C
B.   C only
C.   B only
D.   A and B
E.   A only
Question #10
Cells obtain energy by ________ food molecules such as glucose.
A.   phosphorylating
B.   anabolizing
C.   oxidizing
D.   redoxing
E.   reducing
Question #11
Which of the following best describes the reduction of the coenzyme NAD+?
A.   NAD+ + H -> NADH
B.   NADH -> NAD+ + H
C.   NAD+ + H -> NADH2
D.   NADH -> NAD + H
Question #12
Oxidation-reduction reactions are catalyzed by ________.
A.   enzymes
B.   electrons
C.   lipids
D.   protons
E.   polysaccharides
Question #13
Protons received from NADH ________.
A.   act as coenzymes
B.   are the terminal electron acceptors
C.   are pumped outside the cell
D.   are passed along the electron transport chain along with the electrons
Question #14
Oxygen acts as ________.
A.   a coenzyme
B.   a carrier of electrons, passing electrons down the chain
C.   the terminal electron acceptor
D.   a reducing agent
Question #15
When protons are pumped outside the cell membrane, ________.
A.   a proton motive force is created
B.   NADH gets reduced
C.   water is made
D.   electrons are lost
Question #16
A hydrogen atom consists of a proton and a pair of electrons.
A.   FALSE
B.   TRUE
Question #17
The energy captured in the phosphorylation of ADP to ATP comes from the proton motive force created in respiration.
A.   FALSE
B.   TRUE
Question #18
Proton pumps are protein complexes that ________.
A.   pump protons from the interior of the cell to the exterior
B.   synthesize water from hydrogen and oxygen
C.   pump protons and electrons through the cell membrane
D.   pump protons from the exterior of the cell to the interior
E.   break down water into hydrogen and oxygen
Question #19
Synthesis of ATP via a proton gradient is called ________.
A.   chemiosmosis
B.   Krebs cycle
C.   substrate-level phosphorylation
D.   cyclophosphorylation
E.   glycolysis
Question #20
Which of the following is the enzyme used to synthesize ATP?
A.   ATP kinase
B.   ATP phosphorylase
C.   ATP phosphodiesterase
D.   ATP hydrolase
E.   None of the choices are correct.

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