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24 terms

A.P. Biology Chapter 9: Cell Respiration

cell respiration
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acetyl CoA
the entry compound for the citric acid cycle in cellular respiration, formed from a fragment of pyruvate attached to a coenzyme.
aerobic
Containing oxygen; referring to an organism, environment, or cellular process that requires oxygen
alcohol fermentation
The conversion of pyruvate to carbon dioxide and ethyl alcohol
anaerobic
Lacking oxygen; referring to an organism, environment, or cellular process that lacks oxygen and may be poisoned by it.
ATP synthase
A cluster of several membrane proteins found in the mitochondrial crista (and bacterial plasma membrane) that function in chemiosmosis with adjacent electron transport chains, using the energy of a hydrogen ion concentration gradient to make ATP. Provide a port through which hydrogen ions diffuse into the matrix of a mitrochondrion.
beta oxidation
A metabolic sequence that breaks fatty acids down to two-carbon fragments that enter the citric acid cycle as acetyl CoA.
cellular respiration
The most prevalent and efficient catabolic pathway for the production of ATP, in which oxygen is consumed as a reactant along with the organic fuel.
chemiosmosis
An energy-coupling mechanism that uses energy stored in the form of a hydrogen ion gradient across a membrane to drive cellular work, such as the synthesis of ATP. Most ATP synthesis in cells occurs by chemiosmosis.
citric acid cycle
A chemical cycle involving eight steps that completes the metabolic breakdown of glucose molecules begun in glycolysis by oxidizing pyruvate to carbon dioxide; occurs within the mitochondrion in eukaryotic cells and in the cytosol of prokaryotes; the second major stage in cellular respiration.
cytochrome
an iron-containing protein, a component of electron transport chains in mitochondria and chloroplasts
electron transport chain
A sequence of electron carrier molecules (membrane proteins) that shuttle electrons during the redox reactions that release energy used to make ATP.
facultative anaerobe
an organism that makes ATP by aerobic respiration if oxygen is present but that switches to fermentation under anaerobic conditions
fermentation
a catabolic process that makes a limited amount of ATP from glucose without an electron transport chain and that produces a characteristic end product, such as ethyl alcohol or lactic acid
glycolysis
the splitting of glucose into puyruvate.
lactic acid fermentation
the conversion of puyruvate to lactate with no release of carbon dioxide
NAD+
Nicotinamide adenine dinucleotide, a coenzyme present in all cells that helps enzymes transfer electrons during the redox reactions of metabolism
oxidation
the loss of electrons from a substance involved in a redox reaction
oxidative phosphorylation
the production of ATP using energy derived from the redox reaction of an electron transport chain
oxidizing agent
the electron acceptor in a redox reaction
proton-motive force
The potential energy stored in the form of an electrochemical gradient, generated by the pumping of hydrogen ions across biological membranes during chemiosmosis.
redox reaction
A chemical reaction involving the transfer of one or more electrons from one reactant to another; also called oxidation-reduction reaction.
reducing agent
the electron donor in a redox reaction
reduction
the addition of electrons to a substance involved in a redox reaction
substrate-level phophorylation
the formation of ATP by directly transferring a phosphate group ADP from an intermediate substrate in catabolism