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BIOCHEMISTRY CHAPTER 18 EXAM QUESTIONS WITH CORRECT ANSWERS 100% 2024
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BIOCHEMISTRY CHAPTER 18 EXAM QUESTIONS WITH CORRECT ANSWERS 100% 2024
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BIOCHEMISTRY CHAPTER 18EXAM QUESTIONS WITH CORRECT
ANSWERS 100% 2024
____________ This is where oxidative phosphorylation occurs in eukaryotes. -
CORRECT ANSWERS-mitochondria
____________ An ATP-generating process in which an inorganic substance such as
oxygen serves as the ultimate electron acceptor. - CORRECT ANSWERS-respiration
____________ The permeability of the outer mitochondrial membrane is primarily due
to the presence of these substances. - CORRECT ANSWERS-porins
____________These enzymes play a key role in apoptosis. - CORRECT ANSWERS-
coenzyme Q
____________ This enzyme catalyzes the reduction of O2 - CORRECT ANSWERS-
cytochrome c oxidase
____________ This prosthetic group is present in complexes I, II, and III of electron
transport. - CORRECT ANSWERS-iron-sulfur clusters
____________ This citric acid cycle enzyme is also part of an electron-transport
complex. - CORRECT ANSWERS-succinate dehydrogenase
____________ This is the name given to the hypothesis proposed by Peter Mitchell to
explain how ATP synthesis is coupled to electron transport. - CORRECT ANSWERS-
caspase
____________ Atractyloside inhibits this mitochondrial protein. - CORRECT
ANSWERS-ATP-ADP translocase
____________ This is a process by which cytoplasmic NADH can be re-oxidized by O2
using the electron-transport system. - CORRECT ANSWERS-malate-aspartate shuttle
The unequal distribution of H+ across the inner mitochondrial membrane creates a
________________ . - CORRECT ANSWERS-proton-motive force
In the initial step of Complex I, two high-potential electrons are transferred from NADH
to the ___________ prosthetic group of this complex. - CORRECT ANSWERS-FMN
, Cytochrome ________ is the only water-soluble cytochrome of the electron-transport
chain. - CORRECT ANSWERS-c
Cytochrome c oxidase contains two heme A groups and three ______________ ions. -
CORRECT ANSWERS-copper
________________ carries electrons from Complex III to Complex IV. - CORRECT
ANSWERS-Cytochrome c
The transfer of a single electron to O2 forms the reactive _______________ ion. -
CORRECT ANSWERS-superoxide
_______________ is a molecular assembly in the inner mitochondrial membrane that
carries out the synthesis of ATP. - CORRECT ANSWERS-F1Fo ATPase, or ATP
synthase
In the glycerol phosphate shuttle, cytoplasmic glycerol phosphate dehydrogenase uses
cytoplasmic NADH to reduce _________________ to glycerol-3-phosphate. -
CORRECT ANSWERS-dihydroxyacetone phosphate
Acceptor control of oxidative phosphorylation means that the rate of respiration depends
upon the level of __________. - CORRECT ANSWERS-ADP
_________________ is a poison because it blocks the flow of electrons from
cytochrome c to oxygen. - CORRECT ANSWERS-Carbon monoxide (CO) or Cyanide
(CN-) or Azide (N3-)
What type of gradient is critical to ATP formation by oxidative phosphorylation?
A) Sodium ion
B) pH
C) Proton
D) Potassium ion
E) B and C - CORRECT ANSWERS-E
When glucose is totally oxidized to CO2 and H2O, how many ATP molecules are made
by oxidative phosphorylation relative to the maximum yield?
A) 12 out of 30
B) 26 out of 30
C) 26 out of 32
D) 12 out of 38
E) None of the above - CORRECT ANSWERS-B
What is the chemical effect of oligomycin on aerobic metabolism?
A) The flow of electrons from NADH to CoQ is blocked.
B) The flow of electrons from Cyt a-a3 to oxygen is blocked.
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