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Biology Terms Test 2
Texas state 1320 ch.8
10
Biology
Undergraduate 2
03/29/2010

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Term
ATP
Definition
a molecule composed of the sugar ribose, the base adenine, and three phosphate groups; the major energy carrier in cells. The last two phophate groups are attached by "high energy" bonds.
Term
Cellular respiration
Definition
the oxygen requiring reactions, occuring in mitochondria, that break down teh end products of glycolysis into carbon dioxide and water while capturing large amounts of energy as ATP.
Term
Chemiosmosis
Definition
a process ATP generation in chloroplasts and mitochondria. The movement of electrons down and electron transport system is used to pump hydrogen ions across a membrane, thereby building up a concentratin gradient of hydrogen ions across the membrane; the hydrogen ions diffuse back across the membrane trhough the pores of ATP synthesizing enzymes; the energy of their movement down their concentration gradient drives ATP synthesis
Term
Electron trasport chain
Definition
a series of electron carrier molecules, found in teh thylakoid membrane of chloroplasts and the inner membrane of mitochondria, that extract energy from electronsand generate ATP or other energetic molecules
Term
Fermentation
Definition
anaerobic reactions taht convert the pyruvic acid produced by glycolysis into lactic acid or alcohol and CO2
Term
Glycolysis
Definition
reactions, carried out in the cytoplasm, that break down glucose into two molecules of pyruvic acid, producting two ATP molecules; does not require oxygen but can proceeed when oxygen is present
Term
Intermembrane space
Definition
the fluid space between the inner and outer membranes of mitochondrion
Term
Krebs cycle
Definition
a cyclic series of reactions, occurring in the matrix of mitochondria, in which the acetyl groups from the pyruvic acids produced by glocolysis are broken down to CO2, accompanied by the formation of ATP and electron carriers; aslo called citric acid cycle
Term
Matrix
Definition
the fluid contained within the inner membrane of a mitochondrion
Term
Pyruvate
Definition
a three carbon molecule that is formed by glycolysis and then used in fermentation of cellular respiration
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