Chem 221 - Biochemistry for Science Majors » Fall 2021 » L16 Bioenergetics Part 2 of 2

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Question #1
Which of the following is true about oxidation-reduction reactions?
A.   Dehydrogenases typically remove two electrons and two hydrides.
B.   There are four commonly accessed oxidation states of carbon.
C.   They usually proceed through homolytic cleavage.
D.   During oxidation a compound gains electrons.
E.   Every oxidation must be accompanied by a reduction.
Question #2
Biological oxidation-reduction reactions always involve:
A.   direct participation of oxygen.
B.   mitochondria.
C.   transfer of hydrogens.
D.   transfer of electron(s).
E.   formation of water.
Question #3
Which of the following is the ultimate electron acceptor in aerobic organisms?
A.   NAD+
B.   oxygen
C.   FAD
D.   carbon dioxide
E.   succinate
Question #4
What compound serves as an acyl carrier in metabolism?
A.   tetrahydrofolate
B.   biotin
C.   coenzyme A
D.   FAD
E.   thiamine pyrophosphate
Question #5
Which of the following is a 2-electron oxidizing agent used in catabolic pathways?
A.   NADPH
B.   None of the answers is correct.
C.   Riboflavin
D.   NAD+
E.   FADH2
Question #6
Which of the following is a mechanism by which enzyme catalytic activity is controlled?
A.   allosteric control and covalent modification
B.   All the answers are correct.
C.   allosteric control
D.   feedback inhibition
E.   covalent modification
Question #7
The reduced form of flavin adenine dinucleotide is
A.   FADH
B.   None of the answers is correct.
C.   FAD
D.   FADH++
E.   FADH2
Question #8
C3+ is more oxidized than C2-
A.   TRUE
B.   FALSE
Question #9
For the pair of ions below, indicate which is the more highly reduced species. Co2+/Co+
A.   Co+
B.   Co2+
Question #10
For the pair of compounds below, indicate which is the more highly reduced species. Glucose/CO2
A.   Glucose
B.   CO2
Question #11
For the pair of compounds below, indicate which is the more highly reduced species. Acetate/CO2
A.   Acetate
B.   CO2
Question #12
For the pair compounds below, indicate which is the more highly reduced species. Acetic acid/acetaldehyde
A.   Acetic acid
B.   acetaldehyde
Question #13
Electrons are at a lower energy level when they are associated with less electronegative atoms (such as C) and at a higher energy level when they are associated with a more electronegative atom (such as O).
A.   TRUE
B.   FALSE
Question #14
In cellular respiration, electrons from glucose move towards oxygen, passing to lower and lower energy states and releasing energy at each step.
A.   FALSE
B.   TRUE
Question #15
The most reduced form of carbon is CH4, the most oxidized is CO2
A.   FALSE
B.   TRUE
Question #16
C+ is more oxidized than C4-
A.   TRUE
B.   FALSE
Question #17
The most oxidized form of carbon has -4 charge
A.   TRUE
B.   FALSE
Question #18
The more reduced the compound, the richer in oxygen than in hydrogen.
A.   FALSE
B.   TRUE
Question #19
During cellular respiration, the C atoms of glucose increase their oxidation state.
A.   FALSE
B.   TRUE
Question #20
When a molecule accepts electrons it become reduced
A.   TRUE
B.   FALSE
Question #21
Carbon is more electronegative than hydrogen
A.   FALSE
B.   TRUE
Question #22
What is the oxidation state of the carbonyl carbon is acetone?
A.   +2
B.   +1
C.   0
D.   -2
Question #23
What is the oxidation state of C#2 is glycerol?
A.   +1
B.   0
C.   +3
D.   +2
Question #24
The oxidation state of carbon in methane is
A.   -1
B.   -4
C.   +1
D.   +4
Question #25
The oxidation state of carbon in ethene is
A.   -2
B.   +3
C.   +2
D.   -3
Question #26
Ethene is more oxidized than ethane.
A.   TRUE
B.   FALSE
Question #27
Increase in oxidation state means oxidation.
A.   TRUE
B.   FALSE
Question #28
The more oxidized a carbon is to begin with, the more free energy is released upon oxidation.
A.   FALSE
B.   TRUE
Question #29
Oxidized organic compounds serve as fuels from which electrons can be stripped off during oxidation.
A.   FALSE
B.   TRUE
Question #30
Lipids are a more efficient food source than glucose because lipids are more reduced than glucose.
A.   FALSE
B.   TRUE
Question #31
NAD+ and FAD are water-soluble coenzymes
A.   FALSE
B.   TRUE
Question #32
NAD+ and FAD are water-soluble cofactors
A.   FALSE
B.   TRUE
Question #33
NAD+ is usually very tightly bound to the enzymes, for which they serve as prosthetic group.
A.   TRUE
B.   FALSE
Question #34
FAD move readily from one enzyme to another.
A.   TRUE
B.   FALSE
Question #35
NAD+ accepts a hydrogen ion and two electrons, which are equivalent to a hydride ion.
A.   TRUE
B.   FALSE
Question #36
A hydride ion has two protons and two electrons.
A.   FALSE
B.   TRUE
Question #37
A hydride ion has two protons and one electron.
A.   FALSE
B.   TRUE
Question #38
A hydride ion has one proton and one electron.
A.   TRUE
B.   FALSE
Question #39
A hydride ion has one proton and two electrons.
A.   FALSE
B.   TRUE
Question #40
Proteases are hydrolytic enzymes.
A.   FALSE
B.   TRUE
Question #41
  
A.   TRUE
B.   FALSE
Question #42
Kinases cleave phosphoryl groups
A.   FALSE
B.   TRUE
Question #43
Dehydrogenations involve the presence of electron carriers.
A.   TRUE
B.   FALSE
Question #44
Isomerization reactions involve an intramolecular rearrangement in which redistribution of electrons result in alterations of my different types without a change in the overall oxidation state of the molecule.
A.   FALSE
B.   TRUE

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