quiz 9 Flashcards

1
Q

zymogens have more amino acids than the active enzyme

A

true

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2
Q

enzymes involved in blood clotting and protein digestion are synthesized as inactive enzymes

A

true

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3
Q

allosteric enzymes are usually the last enzyme in a metabolic series of enzymes

A

false

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4
Q

allosteric enzymes have active sites for regulator molecules but no active sites for substrates

A

false

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5
Q

allosteric enzymes can prevent build up of metabolic products

A

true

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6
Q

in some metabolic pathways, the product is the inhibitor to the first enzyme of the pathway

A

true

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7
Q

irreversible inhibitors are usually poisons

A

true

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8
Q

all enzymes can have allosteric inhibition

A

false

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9
Q

doubling the concentration of the enzyme will always double the rate of the reaction

A

false

excess substrate, not after saturation

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10
Q

doubling the concentration of the substrate will always double the rate of the reaction

A

false

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11
Q

very high and very low temperatures can cause permanent denature of an enzyme

A

false

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12
Q

penicillinase is the enzyme that inhibits the last step in bacterial cell wall synthesis

A

false

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13
Q

clavulinic acid is actually an irreversible inhibitor of penicillin

A

false

penicillinase

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14
Q

in large doses curare can be fatal, and in small doses it can act as a muscle relaxant

A

true

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15
Q

acetylcholinesterase is the enzyme that converts choline and acetic acid to acetylcholine

A

false

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16
Q

acetylcholinesterase is permanently inhibited by nerve gas

A

true

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17
Q

if acetylcholinesterase is inhibited it can cause over stimulation of the muscles, convulsions and death

A

true

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18
Q

acetylcholinesterase has an incredibly fast turnover rate

A

true

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19
Q

nerve gas in small quantities can be a muscle relaxant

A

false

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20
Q

butulism blocks the receptor site for acetylecholine on the muscle

A

false

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21
Q

after a heart attack, certain nezymes will be found in large quantities than normal in the blood

A

true

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22
Q

tissue damage can cause enzymes to leak into the blood

23
Q

computerized assay procedures can measure very small quantities of enzymes

24
Q

covalent modification (putting on a phosphate) is useful for regulating enzymes of competing processes

25
glycogenolysis is the process of converting glucose to glycogen
false
26
in an emergency excess glucose can be excreted by the kidneys
true
27
hypoglycemia can affect the brain due to low blood sugar levels
true
28
NOT an anticoagulant
Tylenol vitamin D
29
``` catalytic-ally active apoenzyme coenzyme holoenzyme zymogen cofactor proenzyme ```
holoenzyme
30
which inhibition can be reversed by adding an excess of substrate
competitive
31
which usually forms covalent bonds with the enzyme
irreversible
32
inhibitor looks like the substrate
competitive
33
lead poisoning destroys salt bridges of many enzymes, but it can be removed with EDTA lead poisoning is what kind of inhibition
noncompetitive
34
inhibitor binds to enzyme at different site than substrate but it can be removed
noncompetitive
35
nerve gas is what type of inhibitor
irreversible
36
sulfa drugs resemble the substrate need by bacteria to make folic acid
competitive
37
what is the inactive enzyme that is the precursor to the pepiddase found in the stomach
pepsinogen
38
active peptidase found in the small intestines
trypsin
39
what is the inactive precursor of thrombin
prothrombin
40
what are necessary for the precursor prothrombin to be converted to thrombin
thrombinogen thromboplastin calcium ions vitamin K
41
thrombin causes ____ to be converted to _____
fibrinogen to be converted into fibrin
42
after the clot is not needed, it is digested by what active enzyme
plasmin
43
what is the formation of a clot within a blood vessel called
thrombosis
44
what is it called if the clot breaks loose and moves elsewhere
embolism
45
what compound causes the conversion of fibrinogen to fibrin
thrombin
46
what is the actual blood clot
fibrin
47
what is blood called when fibrinogen is removed
plasma
48
what is an anticoagulant because it complexes with Ca2+ which is needed for blood clotting
oxalic acid citric acid
49
what is the anticoagulant found in small quantities in the blood at all times
heparin
50
what is the sugar part of ATP and NAD and FAD
ribose
51
what is the amine base part of ATP and NAD and FAD
adenine
52
what an enzyme is called that has slight structural differences depending upon what type of tissues is in it
isoenzyme
53
what hormone is called the famine hormone
glucagon
54
what enzyme catalyzes the conversion of glycogen to glucose-1-phosphate
glycogen phosphorylase