quiz 9

Question 1

zymogens have more amino acids than the active enzyme

Answer 1

true

Question 2

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

Answer 2

true

Question 3

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

Answer 3

false

Question 4

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

Answer 4

false

Question 5

allosteric enzymes can prevent build up of metabolic products

Answer 5

true

Question 6

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

Answer 6

true

Question 7

irreversible inhibitors are usually poisons

Answer 7

true

Question 8

all enzymes can have allosteric inhibition

Answer 8

false

Question 9

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

Answer 9

false

excess substrate, not after saturation

Question 10

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

Answer 10

false

Question 11

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

Answer 11

false

Question 12

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

Answer 12

false

Question 13

clavulinic acid is actually an irreversible inhibitor of penicillin

Answer 13

false

penicillinase

Question 14

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

Answer 14

true

Question 15

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

Answer 15

false

Question 16

acetylcholinesterase is permanently inhibited by nerve gas

Answer 16

true

Question 17

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

Answer 17

true

Question 18

acetylcholinesterase has an incredibly fast turnover rate

Answer 18

true

Question 19

nerve gas in small quantities can be a muscle relaxant

Answer 19

false

Question 20

butulism blocks the receptor site for acetylecholine on the muscle

Answer 20

false

Question 21

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

Answer 21

true

Question 22

tissue damage can cause enzymes to leak into the blood

Answer 22

true

Question 23

computerized assay procedures can measure very small quantities of enzymes

Answer 23

true

Question 24

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

Answer 24

true

Question 25

glycogenolysis is the process of converting glucose to glycogen

Answer 25

false

Question 26

in an emergency excess glucose can be excreted by the kidneys

Answer 26

true

Question 27

hypoglycemia can affect the brain due to low blood sugar levels

Answer 27

true

Question 28

NOT an anticoagulant

Answer 28

Tylenol

vitamin D

Question 29

catalytic-ally active 
apoenzyme
coenzyme
holoenzyme
zymogen
cofactor
proenzyme

Answer 29

holoenzyme

Question 30

which inhibition can be reversed by adding an excess of substrate

Answer 30

competitive

Question 31

which usually forms covalent bonds with the enzyme

Answer 31

irreversible

Question 32

inhibitor looks like the substrate

Answer 32

competitive

Question 33

lead poisoning destroys salt bridges of many enzymes, but it can be removed with EDTA lead poisoning is what kind of inhibition

Answer 33

noncompetitive

Question 34

inhibitor binds to enzyme at different site than substrate but it can be removed

Answer 34

noncompetitive

Question 35

nerve gas is what type of inhibitor

Answer 35

irreversible

Question 36

sulfa drugs resemble the substrate need by bacteria to make folic acid

Answer 36

competitive

Question 37

what is the inactive enzyme that is the precursor to the pepiddase found in the stomach

Answer 37

pepsinogen

Question 38

active peptidase found in the small intestines

Answer 38

trypsin

Question 39

what is the inactive precursor of thrombin

Answer 39

prothrombin

Question 40

what are necessary for the precursor prothrombin to be converted to thrombin

Answer 40

thrombinogen

thromboplastin

calcium ions

vitamin K

Question 41

thrombin causes ____ to be converted to _____

Answer 41

fibrinogen
to be converted into
fibrin

Question 42

after the clot is not needed, it is digested by what active enzyme

Answer 42

plasmin

Question 43

what is the formation of a clot within a blood vessel called

Answer 43

thrombosis

Question 44

what is it called if the clot breaks loose and moves elsewhere

Answer 44

embolism

Question 45

what compound causes the conversion of fibrinogen to fibrin

Answer 45

thrombin

Question 46

what is the actual blood clot

Answer 46

fibrin

Question 47

what is blood called when fibrinogen is removed

Answer 47

plasma

Question 48

what is an anticoagulant because it complexes with Ca2+ which is needed for blood clotting

Answer 48

oxalic acid

citric acid

Question 49

what is the anticoagulant found in small quantities in the blood at all times

Answer 49

heparin

Question 50

what is the sugar part of ATP and NAD and FAD

Answer 50

ribose

Question 51

what is the amine base part of ATP and NAD and FAD

Answer 51

adenine

Question 52

what an enzyme is called that has slight structural differences depending upon what type of tissues is in it

Answer 52

isoenzyme

Question 53

what hormone is called the famine hormone

Answer 53

glucagon

Question 54

what enzyme catalyzes the conversion of glycogen to glucose-1-phosphate

Answer 54

glycogen phosphorylase