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Multiple Choice Quiz
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1

What statement regarding enzymes is incorrect?
A)They can be recycled.
B)They are not permanently changed by a chemical reaction.
C)They increase the activation energy required for a chemical reaction to occur.
D)They are composed of protein and may require cofactors.
E)They act as organic catalysts.
2

Which of the following is the substrate for ribozymes?
A)Proteins
B)Metal ions
C)Ribosomes
D)RNA
E)DNA
3

Metallic cofactors perform what function in enzymatic reactions?
A)They are involved in self splicing of RNA.
B)They activate enzymes.
C)They speed up chemical reactions.
D)They perform necessary alterations to a substrate molecule.
E)They serve as transient carriers of vitamins.
4

What enzymes are always present in a cell at relatively constant amounts?
A)Induced enzymes
B)Exoenzymes
C)Coenzymes
D)Endoenzymes
E)Constitutive enzymes
5

What enzymes help pathogens avoid host defenses or promote their multiplication in tissue?
A)Induced enzymes
B)Exoenzymes
C)Coenzymes
D)Endoenzymes
E)Constitutive enzymes
6

Denaturation of enzymes can occur under all but which of the following conditions?
A)Low temperatures
B)High temperatures
C)Low pH
D)High pH
E)Presence of heavy metals or alcohols
7

Allosteric enzymes are commonly found in what metabolic regulatory system?
A)Competitive inhibition
B)Enzyme induction
C)Regulatory inhibition
D)Enzyme repression
E)Feedback inhibition
8

What controls feedback inhibition, enzyme repression, and enzyme induction?
A)End-products
B)Molecular mimics
C)Substrates
D)Reactants
E)Bioenergetics
9

For the most part, what type of energy operates cell transactions?
A)Thermal
B)Electrical
C)Atomic
D)Chemical
E)Radiant
10

What is the most common electron carrier in biological systems?
A)FAD
B)Coenzyme A
C)NAD
D)NADP
E)Compounds of the respiratory chain
11

Which statement describes why ATP is an unstable high-energy molecule?
A)The purine base adenine repels the ribose.
B)The size, electrostatic charges, and physical proximity of the three phosphate groups
C)The bond that joins the phosphate groups releases energy when it is broken.
D)The absence of a hydroxyl group on the 2' carbon of the ribose allows for higher energy potential.
E)The presence of a ringed sugar causes the bond between it and the phosphates to be unstable.
12

What is the process by which ATP is formed through a series of oxidation-reduction reactions that occur during the final phase of respiration?
A)Photophosphorylation
B)Substrate-level phosphorylation
C)Phosphorylation
D)Oxidative phosphorylation
E)Fermentation
13

During the process of group translocation, glucose is brought into the cell and is chemically modified into what compound, which prevents it from leaving the cell?
A)Pyruvate
B)Carbon dioxide
C)ATP
D)Acetyl-CoA
E)Glucose-6-phosphate
14

The NADH molecules generated during the single oxidation-reduction reaction in glycolysis will undergo further reactions in what pathway?
A)Electron transport chain
B)The conversion step
C)Pentose phosphate pathway
D)The TCA cycle
E)Fermentation
15

In glycolysis a net gain of two ATPs are generated by what process?
A)Chemiosmosis
B)ADP processing
C)Substrate level phosphorylation
D)Electron transport
E)The splitting of a 6-carbon sugar to two 3-carbon sugars
16

Where does the TCA cycle take place in bacteria?
A)Mitochondrial matrix
B)Cytoplasm
C)Mitochondrial membrane
D)Cytoplasmic membrane
E)Nucleus
17

In aerobic respiration when is the first molecule of carbon dioxide released?
A)During chemiosmosis
B)When pyruvic acid is reduced to lactic acid
C)When glucose is phosphorylated in glycolysis
D)Following the first turn of the TCA cycle
E)During the conversion step when pyruvic acid is converted to acetyl-CoA
18

For each molecule of glucose that undergoes aerobic respiration, how many carbon dioxide molecules are released?
A)One
B)Three
C)Four
D)Six
E)Twelve
19

What is not a compound in the electron transport system?
A)NADH dehydrogenase
B)Flavoproteins
C)Coenzyme Q
D)NADPH dehydrogenase
E)Cytochromes
20

The coupling of ATP synthesis to electron transport is known as what?
A)Oxidative phosphorylation
B)Chemiosmosis
C)ATP synthesis
D)Substrate level phosphorylation
E)Proton motive force
21

Which of the following drives the synthesis of ATP by ATP synthase in oxidative phosphorylation?
A)NADH
B)Distribution of electric potential across a membrane
C)FADH
D)Cytochrome oxidase
E)Intermediate space of the mitochondria
22

What pathway is a significant intermediate source of pentoses for nucleic acid synthesis?
A)Glycolysis
B)TCA cycle
C)Electron transport chain
D)Fermentation
E)Hexose monophosphate shunt
23

Which statement regarding fermentation is incorrect?
A)Glucose is completely oxidized.
B)It does not require oxygen.
C)Organic compounds serve as the terminal electron acceptors.
D)Only a small amount of ATP is generated.
E)It yields the most varied products of the metabolism of Pyruvate.
24

The souring of milk is due to the production of what compound during fermentation?
A)Ethanol
B)Lactic acid
C)Acetic acid
D)Carbon dioxide
E)Propionic acid
25

Which is not a metabolic intermediate used in amphibolic pathways?
A)Glyceraldehyde-3-phosphate
B)Acetyl CoA
C)Fructose-1,6-bisphosphate
D)Pyruvic acid
E)Oxaloacetic acid





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