The Cell : Cellular Respiration

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90 Terms

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Metabolism
an emergent property of life that arises from interactions between molecules within the cell
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Catabolic pathways
release energy by breaking down complex molecules into simpler compounds.
release energy by breaking down complex molecules into simpler compounds.
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Cellular respiration
the breakdown of glucose in the presence of oxygen, is an example of a pathway of catabolism
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Anabolic Pathways
consume energy to build complex molecules from simpler ones
consume energy to build complex molecules from simpler ones
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Synthesis of protien
from amino acids is an example of anabolism
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Bioenergetics
the study of how organisms manage their energy resources
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Kinetic Energy
energy associated with motion
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Energy
the capacity to cause change
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Heat (thermal energy)
is kinetic energy associated with random movement of atoms to molecules
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Potential Energy
is energy that matter possesses because of its location of structure
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Chemical Energy
potential energy available for release in a chemical reaction
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Thermodynamics
study of energy transformations
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Isolated system
isolated from its surroundings
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Open system
energy and matter can be transferred between the system and its surroundings
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First Law of Thermodynamics / Principle of conservation of energy
Energy can be transferred and transformed, but it cannot be created nor destroyed
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Second Law of Thermodynamics
every energy transfer or transformation increases the entropy (disorder) of the universe
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Free Energy Change (Delta G)
A living system’s free energy is energy that can do work when temperature and pressure are uniform as in living cell
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Negative delta G (Triangle G)
Initial state to finale state (hint delta G)
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Exergonic reaction
proceeds with a net release of free energy and is spontaneous
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endergonic reaction
absorbs free energy from its surroundings and is non spontaneous
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Endergonic Reaction (will require energy)
What type of reaction is anabolism?
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Exergonic Reaction (will release energy)
What type of reaction is catabolism?
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closed
Reactions in a (--------) system eventually reach equilibrium and then do no work
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Never
metabolism is (----) at equilibrium
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catabolic pathway
(-----) in a cell releases free energy in a series of reactions
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open systems
Cells are (-------------) experiencing a constant flow of materials
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Enzymes
speed up metabolic reactions by lowering energy barriers
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Catalyst
a chemical agent that speeds up a reaction without being consumed by the reaction
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Enzyme
is a catalytic protein.
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Hydrolysis
example of an enzyme catalyzed reaction
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TRUE
All enzymes are proteins but not all proteins are enzymes
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free energy of activation, or activation energy (EA).
initial energy needed to start a chemical reaction
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lowering
Enzymes catalyze reactions by (-------) the EA barrier
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Respiration
the process that the body uses to release energy from digested food (glucose)
the process that the body uses to release energy from digested food (glucose)
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Respiration
the reverse reaction of photosynthesis
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Adenosine Triphosphate (ATP)
Energy source for all cells. Considered the “energy currency” of the cell.
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Adenosine Diphosphate (ADP)
when ATP is converted into (--------) it releases large amounts of energy
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Redox Reactions
transfer of electrons during chemical reactions releases energy stored in organic molecules
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Oxidation
a substance loses electrons, or is oxidized
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Reduction
a substance gains electrons, or is reduced (the amount of positive charge is reduced)
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Reducing Agent
the electron donor
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Oxidizing agent
electron receptor
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Three
How many stages are there to harvest energy from glucose ?
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Glycolysis
Stage in harvesting energy from glucose where the breaking down of glucose into two molecules of pyruvate happens
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The citric acid cycle
Stage in harvesting energy from glucose where the completion of breakdown of glucose happens
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Oxidative phosphorylation
Stage in harvesting energy from glucose where most of the ATP synthesis (90%) happens
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Glycolysis
(“sugar splitting”) breaks down glucose into two molecules of pyruvate
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Pyruvate
Glycolysis breaks down glucose into two molecules of (------)
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two molecules
Glycolysis breaks down glucose into (----) molecules of pyruvate
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Glycolysis
occurs whether or not O2 is present
occurs whether or not O2 is present
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Energy investment phase & Energy payoff phase
Two major phases of glycolysis
Two major phases of glycolysis
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Mitochondrion
where pyruvate enters in the presence of oxygen & where oxidation of glucose is completed
where pyruvate enters in the presence of oxygen & where oxidation of glucose is completed
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acetyl coenzyme A (Acetyl CoA)
pyruvate is converted to (------) to begin the citric acid cycle
pyruvate is converted to (------) to begin the citric acid cycle
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Fermentation and anaerobic respiration
enable cells to produce ATP without the use of oxygen.
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anaerobic respiration or fermentation
glycolysis couples with (-------) to produce ATP
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Anaerobic respiration
uses an electron transport chain with a final electron acceptor (ex. sulfate)
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Fermentation
uses substrate-level phosphorylation instead of an electron transport chain to generate ATP
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eight steps
How many steps are there in the citric acid cycle?
How many steps are there in the citric acid cycle?
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NADH and FADH 2
produces by the cycle relay electrons extracted from food to the electron transport chain
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oxidative phosphorylation
NADH and FADH 2 then donate electrons to the electron transport chain which powers ATP synthesis via (-----)
NADH and FADH 2 then donate electrons to the electron transport chain which powers ATP synthesis via (-----)
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yes
Can we catabolize other macromolecules other than glucose?
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Proteins
is digested to amino acids; amino groups can fee glycolysis or the citric acid cycle
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Fats
are digested to glycerol (used in glycolysis) and fatty acids (used in generating Acetyl CoA)
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1 glucose, 2 ADP, 2 ATP, 2 NAD+
what are the reactants of glycolysis?
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2 ATP
how many atp will glycolysis produce?
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2 NADH
how many NADH will glycolysis produce?
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2 pyruvate
how many pyruvate will glycolysis produce?
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acetyl COA
pyruvate oxidation in glycolysis is where 2 pyruvate produces 2 what ?
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2NADH
pyruvate oxidation in glycolysis is where (-----) is produces
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2 pyruvate, 2 coA, & 2NAD+
what are the reactants of pyruvate oxidation?
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2 CO2
pyruvate oxidation produces how many CO2?
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2 acetyl coA
pyruvate oxidation produces how many acetyl coA?
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2 NADH
pyruvate oxidation produces how many NADH?
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Krebs Cycle / Citric Acid Cycle
the main purpose of this cycle is to make NADH & FADH
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cytoplasm / cytosol
where does glycolysis takes place?
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Anaerobic (does not need oxygen)
is glycolysis anaerobic / aerobic?
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mitochondria
where does pyruvate oxidation occurs?
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aerobic (needs oxygen)
is citric acid cycle aerobic or anaerobic?
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2 acetyl coA, 6 NAD+ & 2 FAD+
what are the reactants of citric acid cycle?
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6 NADH &. 2 FADH
how many NADH &. FADH does citric acid cycle produce?
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4 CO2 & 2 ATP
how many CO2 & ATP does citric acid cycle produce?
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aerobic (needs oxygen)
is oxidative phosphorylation aerobic or anaerobic?
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inner mitochondria
where does oxidative phosphorylation occurs?
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1 O2 , 10 NADH, 2 FADH
what are the reactants of oxidative phosphorylation
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38 ATP
oxidative phosphorylation produces how many ATP ? (maximum)
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26 - 34 ATP produced
oxidative phosphorylation produces how many ATP ?
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Water
other than ATP what does oxidative phosphorylation also produce?
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oxidative phosphorylation
Electrons are transferred from the NADH and FADH to protein complexes and electron carriers
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oxidative phosphorylation
Electrons are used to generate a proton gradient as protons are pumped across to the intermembrane space
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ATP synthase
Protons can travel through an enzyme called