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Microbiology Exam Ch. 8

Chapter 8
STUDY
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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
Enzymes that are always present in constant amounts in a cell are called _____________.
Constitutive enzymes
The electron transport system _________________.
Generates a concentration gradient of protons
At what site does oxidative phosphorylation occur in bacteria?
On the cell membrane
Biosynthetic reactions that require energy for the conversion of molecular subunits into larger molecules are called __________.
Anabolic reactions
In the absence of enzymes, most metabolic reactions ______________.
Occur at a very slow rate
In anaerobic respiration, all of the following can serve as the final electron acceptor, except
Oxygen
In Eukaryotes, the krebs cycle takes place ____________________.
In the mitochondria
An enzyme ________________the activation energy required for a chemical reaction
Lowers
Which of the following are products of aerobic respiration?
All of these
In cellular respiration, which of the following represents the correct order of events?
Food; glycolysis; Krebs cycle; electron transport chain
The Calvin cycle operates during which part of photosynthesis?
Only in the light-independent reactions
The bond between an enzyme and its substrate cannot be broken
False
What is the starting compound for aerobic respiration?
Glucose
Where do the light-dependent reaction of photosynthesis occur?
Thylakoids of the chloroplasts
What is the electron source for electron transport in photosynthesis in most cells?
NADPH
Oxygen
Water
What is the concentration gradient for hydrogen ions that is produced during the electron transport chain called?
Proton motive force
Organic materials that activate enzymes are called ________________?
Coenzymes
What is the term for the concept that one molecule can act at multiple places along metabolic pathways?
Amphibolism
In the absence of oxygen in human muscle cells, what is pyruvic acid converted to?
Lactic acid
At the end of the Krebs cycle a molecule of ___________________ is produced to restart the cycle.
Lactic acid
Oxaloacetic acid
ATP synthase directly uses _________________ as energy to make ATP.
The proton motive force
What is the active site of an enzyme?
The place on the enzyme where a substrate will bind
Enzymes that are produced only when substrate is present are termed _______________.
Induced enzymes
Enzymes are _________________________.
Proteins that function as catalysts
Catabolism is a form of metabolism in which ____________________ molecules are converted into _________________ molecules.
Large, small
What is another term for the light independent reaction of photosynthesis?
Calvin cycle
A product of glycolysis is ______________.
Pyryvic acid
Important components of coenzymes are _________________.
Vitamins
Enzymes are completely consumed in the chemical reactions they participate in.
False
What are substances that activate enzymes called?
Cofactors
What is the final electron acceptor in the electron transport chain?
Oxygen
As hydrogen ions move through the ______________, ADP is phosphorylated because of a conformational change.
ATP synthase
What process is very similar to a reverse of glycolysis?
Photolysis
Oxidative phosphorylation
Calvin cycle
The breakdown of fats into acetyl CoA that can enter the Krebs cycle is called _______________.
Beta oxidation
A reaction that releases energy as it occurs is called a _______________ reaction.
Exergonic
A holoenzyme is a combination of a protein and one or more substances called ____________.
Cofactors
Photosynthesis converts energy from ______________ into chemical energy.
The sun
How many rounds of the Krebs cycle occur as a result of 1 molecule of glucose entering glycolysis?
2
1
0
4
What is metabolism?
All of the chemical processes that take place within a living organism
How many molecules of ATP are produced from one molecule of glucose during aerobic respiration?
38
ATP molecules are catalysts that lower the activation energy needed to initiate a reaction.
False
How many compounds are involved in carrying out the electron transport that occurs during the respiratory chain?
7
The process of using energy from the sun to convert carbon dioxide to organic carbon compounds such as glucose is called ____________________.
Carbon Fixation
What process produces most of the ATP needed by cells.
Oxidative phosphorylation
Which sort of energy do cells normally utilize?
Chemical energy
All of the following are exoenzymes, except ______________.
ATP synthase
Oxygenic photosynthesis is the dominant type of photosynthesis on Earth.
True
Which pigments convert the photons into chemical energy?
Chlorophylls
Glycolysis forms how many molecules of pyruvic acid from one molecule of glucose?
2
Photosynthetic organism convert the energy of __________________ into chemical energy.
Light
The compound that enters the Krebs cycle is _________________.
Acetyl coenzyme A
During aerobic cellular respiration, the final electron acceptor is ______________.
Oxygen
Enzymes that are regularly found in a cell are termed _____________.
Constitutive enzymes
What substance acts as an energy repository within cells.
ATP
During which of the phases of cellular respiration is the majority of ATP formed?
Electron transport
A substance that will increase the rate of a chemical reaction without being consumed in the reaction is called a ______________..
Catalyst
In addition to oxaloacetate, the products of the krebs cycle are _________________.
NADH, FADH2, ATP, and CO2
What is the energy required to initiate a chemical reaction?
Activation energy
An apoenzyme is where the ___________________ is located.
Active site
In eukaryotes, glycolysis takes place _______________.
In the cytoplasm
What is the term for the disruption of the bonds that maintain the shape of an enzyme?
Denaturation
What is the term for the incomplete oxidation of a carbohydrate in the absence of oxygen?
Fermentation
The most likely place where an exoenzyme participates in a chemical reaction is
Outside of the cell
Intermediaries in ________ can be used to produce amino acids.
Fermentation
Oxidative phosphorylation
glycolysis
photosynthesis
Krebs cycle
In the absence of oxygen in human muscle cells, what is pyruvic acid converted to?
ATP synthese
Lactic acid
Oxaloacetic acid
Acetyl acid