Question :
31.Which of the following carry electrons from the citric acid : 1309710
31.Which of the following carry electrons from the citric acid cycle to the electron carriers of the electron transport chain?
a.CoA
b.NAD+
c.FADH2
d.more than one correct response
e.no correct response
32.Which of the following carriers transports electrons from protein complex I to protein complex III during operation of the electron transport chain?
a.cyt a3
b.cyt c1
c.FMN
d.more than one correct response
e.no correct response
33.Which of the following substances is both a reactant and a product in the operation of the electron transport chain?
a.O2
b.FADH2
c.CoQ
d.more than one correct response
e.no correct response
34.At which protein complex site in the electron transport chain does proton pumping occur?
a.protein complex I
b.protein complex II
c.protein complex III
d.more than one correct response
e.no correct response
35.Oxidative phosphorylation is the process in which ATP is synthesized
a.from ATP synthase
b.from ADP
c.using energy from the dissipation of a “proton gradient”
d.more than one correct response
e.no correct response
Use the following to answer the questions below:
In each of the following multiple-choice questions characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices:
a) All three statements are true.
b) Two of the three statements are true.
c) Only one of the statements is true.
d) None of the statements is true.
36.Statements:
(1) In the last step of the ETC, molecular oxygen is converted to water.
(2) The B vitamin portion of the structure of coenzyme A, which involves riboflavin, is the reactive site in the molecule.
(3) All of the reactions of the CAC take place in the mitochondrial matrix.
a.All three statements are true.
b.Two of the three statements are true.
c.Only one of the statements is true.
d.None of the statements is true.
37.Statements:
(1) FADH2 is the oxidized form of the coenzyme flavin adenine dinucleotide.
(2) All of the electron carriers of the ETC contain iron, and one of them also contains copper.
(3) One turn of the CAC generates two CO2 molecules, two NADH molecules, and two FAD2 molecules.
a.All three statements are true.
b.Two of the three statements are true.
c.Only one of the statements is true.
d.None of the statements is true.
38.Statements:
(1) Both ribosomes and mitochondria are examples of organelles.
(2) Cytochromes are heme-containing proteins that can undergo reversible oxidation and reduction.
(3) The electrons that pass through the various steps of the ETC lose some energy with each transfer along the chain.
a.All three statements are true.
b.Two of the three statements are true.
c.Only one of the statements is true.
d.None of the statements is true.
39.Statements:
(1) In the first step of the CAC, a C2 molecule and a C4 molecule combine to produce a C6 molecule.
(2) ATP, ADP, and AMP differ from each other in the number of adenine subunits present.
(3) The process by which ATP is produced during the operation of the ETC is called oxidative phosphorylation.
a.All three statements are true.
b.Two of the three statements are true.
c.Only one of the statements is true.
d.None of the statements is true.
40.Statements:
(1) High-energy phosphate compounds contain one or more strained bonds that release above-average amounts of energy when broken.
(2) In the ETC, NADH is oxidized to NAD+.
(3) The “fuel” for the CAC is acetyl CoA.
a.All three statements are true.
b.Two of the three statements are true.
c.Only one of the statements is true.
d.None of the statements is true.
41.Statements:
(1) The CO2 molecules produced in the citric acid cycle are the CO2 molecules we exhale in the process of respiration.
(2) The oxidized form of nicotinamide adenine dinucleotide is NAD+ and the reduced form is NADH2.
(3) During ETC operation, a buildup of protons occurs on the matrix side of the inner mitochondrial membrane.
a.All three statements are true.
b.Two of the three statements are true.
c.Only one of the statements is true.
d.None of the statements is true.
42.Statements:
(1) Two ribose subunits are present in the coenzyme flavin adenine dinucleotide.
(2) In the common metabolic pathway, 10 molecules of ATP are produced per acetyl CoA catabolized.
(3) The purpose of step 2 in the CAC is to convert a secondary alcohol to a tertiary alcohol.
a.All three statements are true.
b.Two of the three statements are true.
c.Only one of the statements is true.
d.None of the statements is true.
43.Statements:
(1) Some, but not all, protein complex sites associated with the ETC serve as proton pumps.
(2) The rate at which the CAC operates is controlled by the body’s need for ATP.
(3) Anabolic reactions usually require energy input in order to proceed.
a.All three statements are true.
b.Two of the three statements are true.
c.Only one of the statements is true.
d.None of the statements is true.
44.Statements:
(1) Mitochondria contain a multifolded outer membrane and an inner membrane.
(2) Two of the electron carriers of the ETC transport chain are “mobile,” moving between protein complex sites.
(3) The NADH and FAD2 formed during the CAC carry electrons and H+ ions to the ETC.
a.All three statements are true.
b.Two of the three statements are true.
c.Only one of the statements is true.
d.None of the statements is true.
45. Statements:
(1) Inhibition of the ETC is the mechanism by which cyanide exerts its deadly effect.
(2) Brown fat cells contain the uncoupling agent thermogenin, a protein that creates a proton channel through the outer mitochondrial membrane.
(3) One of the body’s mechanisms for adaptation to cold is the production of brown fat tissue.
a.All three statements are true.
b.Two of the three statements are true.
c.Only one of the statements is true.
d.None of the statements is true.
