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micro quiz chapter 8

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When glucose is broken down by glycolysis during bacterial fermentation, what is the net production of ATP?
2 ATP
When the product of reaction A becomes the reactant of reaction B, the metabolic pathway is
linear
The principle sites of amphibolic interaction occur during
glycolysis and Krebs cycle
During which of the phases of cellular respiration is the majority of ATP formed?
electron transport
Feedback inhibition is best described as
Product binding to enzyme in non-competitive site
An apoenzyme
Is the protein part of a holoenzyme
In addition to electrons, which of the following is also involved in electron transfer?
hydrogen
True or False: Photosynthesis occurs in chloroplasts of prokaryotes.
false
In which pathway is the most NADH generated?
Krebs cycle
True or false:





ATP synthase is a complex enzyme needed for oxidative phosphorylation.
true
True or False:





Oxygen-containing ions are used by some bacteria in a cytochrome-like system.
true
Which of the following is not true of anaerobic respiration?
Uses the same final electron acceptors as aerobic respiration
True or False:





Building block molecules for biosynthetic pathways come from the cell's catabolic pathways and from the environment.
true
The majority of reduced NAD is produced in
the Krebs cycle
In the cell, energy released by electrons is often used to phosphorylate
ADP
The property of organisms to integrate catabolic and anabolic pathways to improve cell efficiency is called
Amphibolism
All of the following are exoenzymes except
ATP synthase
FAD, NADP, NAD and coenzyme A are all _____ carriers.
Both hydrogen and electron
Which of the following is not a process that regenerates ATP?
Reductive phosphorylation
When enzyme action stops due to a buildup of end product, this control is called
Feedback inhibition
The cell's metabolic reactions involve the participation of _____ that lower the activation energy needed for the initiation of a reaction.
Enzymes
In bacterial cells, the electron transport system is located in the
Cell membrane
True or False:





Microbes can utilize only carbohydrates for energy production.
false
True or False:





ATP molecules are catalysts that lower the activation energy needed to initiate a reaction.
false
Enzymes that catalyze moving a phosphate from one substrate to another are called
Phosphotransferases
The formation of citric acid from oxaloacetic acid and an acetyl group begins
the Krebs cycle
All of the following pertain to glycolysis except
Degrades glucose to CO2 and H2O
Reduction of nitrogen-oxygen ions and compounds by some bacteria is called
Denitrification
During aerobic cellular respiration, the final electron acceptor is
Oxygen
In which stage of aerobic respiration is water produced?
electron transport system
Each of the following are electron carriers except
FADP
The step involving ATP, hexokinase and the phosphorylation of glucose to glucose-6-phosphate is
An example of substrate-level phosphorylation
The process of forming glucose from various metabolic intermediates is called
Gluconeogenesis
Fermentation
Requires an organic electron acceptor
True or False: All organisms that are photosynthetic are oxygenic.
false
What chemical causes death in many eukaryotes because it blocks cytochrome c oxidase?
Cyanide
Each FADH2 from the Krebs cycle enters the electron transport system and gives rise to _____ ATP's.
2
True or False:





All aerobic bacterial species have identical electron acceptors in their electron transport systems.
false
Substrate level phosphorylation occurs in
Glycolysis and Krebs cycle
Which of the following are not photosynthetic pigments?
Leukophylls
Most electron carriers are
Coenzymes
Mixed acid fermentation
Produces several different acids plus CO2 and H2 gases
_____ reactions are anabolic reactions involving ligases for synthesis and the release of one water molecule for each bond formed.
Condensation
Ribozymes are
Catalysts for RNA splicing
True or False:





Hydrolysis reactions are catabolic reactions that use water to split the reactant into smaller subunits.
true
True or False:





Exoenzymes from pathogens are called virulence factors.
true
The most likely place where an exoenzyme participates in a chemical reaction is
Within the cell membrane
Enzymes that function inside a cell are
Endoenzymes
Enzymes that are always present, regardless of the amount of substrate are
Constitutive enzymes
Important components of coenzymes are
Vitamins
Intermediates from the Krebs cycle can be converted to amino acids by the process of
Amination
True or False: Recently discovered bacteria inhabiting the ocean floor undergo photosynthesis using light from chemical reactions, the breaking of mineral crystals or from bubble formation.
true
True or False:





ATP is composed of deoxyribose, adenine and 3 phosphate groups.
false
Amination is the addition of a(n) _____ group to a carbon skeleton.
Amino
The reactions of fermentation function to produce _____ molecules for use in glycolysis.
NAD
A holoenzyme is a combination of a protein and one or more substances called
Cofactors
Each NADH that enters the electron transport system gives rise to _____ ATP.
3
Enzymes that catalyze removing electrons from one substrate and adding electrons to another are called
Oxidoreductases
True or False:





Denaturing an apoenzyme will destroy the three-dimensional shape of the protein, making it nonfunctional.
true
Which of the following is not true of the light-dependent reactions of photosynthesis?
Generates glucose from CO2 and H2O
Which of the following is not involved in the step that occurs between glycolysis and the Krebs cycle?
Pyruvic acid accepts electrons from NADH
The redox carriers of the electron transport chain that have a tightly bound metal atom responsible for accepting and donating electrons are
The cytochromes
Enzymes that are secreted by a cell to hydrolyze reactions are
Exoenzymes
A type of cofactor would be
Metallic ions
Exergonic reactions
Occur during aerobic cellular respiration
Enzymes that are only produced when substrate is present are termed
Induced enzymes
Enzymes are
Proteins that function as catalysts
Which of the following are characteristics of the Calvin cycle?
Produces glucose as an end product
True or False:





Glyceraldehyde-3-phosphate is an intermediary of glycolysis that can also be utilized in biosynthetic pathways.
false
In bacterial cells, when glucose is completely oxidized by all the pathways of aerobic cellular respiration, what is the maximum number of ATP generated?
38 ATP
True or False:





Only yeast produces alcohol as a fermentation product.
false
Metabolic pathways that regenerate their starting point are called _____ pathways.
Cyclic
Enzymes that can function at boiling water temperatures or other harsh conditions would be termed
Extremozymes
Glycolysis
Uses 2 ATP, produces 4 ATP, without oxygen
True or False:





The best way to control a metabolic pathway is to control the fastest enzyme in the series.
false
How many carbon dioxide molecules are produced by the complete aerobic breakdown of one glucose molecule?
6
As the electron transport carriers shuttle electrons, they actively pump _____ into the outer membrane compartment setting up a concentration gradient called the proton motive force.
Hydrogen ions
Each of the following are denaturing agents except
Low temperature
All of the chemical reactions of the cell are called
Metabolism
Formation of peptide bonds between amino acids to build a polypeptide would be called
Anabolism
Reactants are converted to products by
Breaking and forming bonds
Each of the following are true of enzymes except
They increase the activation energy of a reaction
Enzymes that catalyze removal of carbon dioxide from a substrate are called
Decarboxylases
An oxidase detection test can be used to identify certain bacteria because they lack
cytochrome c oxidase