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Enzymes 3

QuestionAnswer
Enzymes that hydrolyze the peptide bond in proteins Proteases
Transfers an electron from NADPH to the heme Fe in P450, reducing the Fe(III) to Fe(II) Cytochrome P450 reductase
Complex I of the ETC NADH dehydrogenase
Complex III of the ETC Cytochrome c reductase
Complex IV of the ETC Cytochrome oxidase
On the surfae of the inner membrane, this enzyme reoxidizes gly-3P to DHAP. Glycerol-3-P dehydrogenase
Catalyzes the breakdown of superoxides to water and hydrogen peroxide Superoxide dismutase (SOD)
Catalyzes dismutation Superoxide dismutase (SOD)
Catalyzes the decomposition of of hydrogen peroxide Catalase
Four enzymes that are the body's first line of enzymatic defense against oxidative damage. Superoxide dismutase (SOD), Catalase, Glutathione peroxidase, Peroxiredoxins
Aresenate prevents ATP production by this enzyme Phosphoglycerate kinase
Flourine inhibits this enzyme Enolase
Inhibited by quinolones, nalidixic acid and ciprofloxacin DNA gyrase of E. coli
The enzyme required for the metabolism of alcohol. Aldehyde dehydrogenase
Inhibition of this enzyme in the liver stimulates LDL receptors, leading to an increased clearance of LDL from the bloodstream and a decrease in blood cholesterol level HMGCoA reductase
This enzyme cleaves fatty acids from triacyglycerol Lipase
This enzyme complex forms fatty acids up to chain length Fatty acid synthase
This enzyme splits off the polar head group leaving diacyglycerol (DAG) and the phosphorylated polar head group. Phospholipase C
The family of stating drugs lower cholesterol by inhibiting this enzyme HMGCoA reductase
This enzyme overcomes the irreversible pyruvate kinase reaction in glycolysis Phosphoenolpyruvate carboxykinase
True or False: Each enzyme has a pH optimum at which it best functions. True
True or False: Enzymes function equally well at any pH. False
True or False: Enzyme show specificity for one stereoisomer of a molecule over the other stereoisomer. True
True or False: Enzymes do no show specificity for one stereosiomer of a molecule over the other stereoisomer. False
True or False: The increase in rate of an enzyme-catalyzed reaction with increasing substrate is saturable. True
True or False: The increase in rate of an enzyme-catalyzed reaction with increasing substrate is not saturable. False
True of False: Catalysis of enzymes depends solely on the amino acid side chains of enzymes. False
HIV protease belongs to which class of protease? Aspartate
True or False: Inhibition of an enzyme by a competitive inhibitor can be overcome with excess of substrate. True
True or False: Inhibition of an enzyme by a competitive inhibitor can not be overcome with excess of substrate. False
True or False: Inhibition of an enzyme by a competitive inhibitor is reversible. True
True or False: Inhibition of an enzyme by a competitive inhibitor is irreversible. False
This enzyme has three active sites whose affinity for ATP change with proton movement ATP synthase
The toxic effects of cyanide are due to _________________. inhibition of cytochrome oxidase (Complex IV)
This enzyme catalyzes an anaplerotic reaction in the TCA cycle. Pyruvate carboxylase
This enzyme converts lactate to pyruvate in the Cori cycle Hepatic lactate dehydrogenase
This enzyme is unique to the Pentose Phosphate Pathway Transketolase
This type of inhibitor binds to the active site and is acted upon by the enzyme just as if it was a normal substrate. The enzyme uses its own catalytic machinery to inactivate itself. Suicide inhibitor
This type of inhibitor binds to the enzyme and takes it out of commission, although it does not bind to the active site. Non-competitive inhibitor
This type of inhibitor binds to the active site and competes with the substrate for its occupation. Competitive inhibitor
An enzyme that removes a ph0sphate from the substrate. Phosphatase
Synthesizes cAMP. Adenylyl cyclase
cAMP stimulates the activity of this enzyme. Protein kinase A
True or False: Protein kinase A is stimulated by removal of an inhibitory subunit. True
True or False: Protein kinase A is inhibited by removal of an inhibitory subunit. False
This enzyme hydrolyses PIP2 to produce DAG and IP3. Phospholipase C
Created by: P1StudyStack on 2008-12-14



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