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Flashcards in quiz 9 Deck (54)
1

zymogens have more amino acids than the active enzyme

true

2

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

true

3

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

false

4

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

false

5

allosteric enzymes can prevent build up of metabolic products

true

6

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

true

7

irreversible inhibitors are usually poisons

true

8

all enzymes can have allosteric inhibition

false

9

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

false

(excess substrate, not after saturation)

10

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

false

11

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

false

12

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

false

13

clavulinic acid is actually an irreversible inhibitor of penicillin

false

penicillinase

14

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

true

15

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

false

16

acetylcholinesterase is permanently inhibited by nerve gas

true

17

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

true

18

acetylcholinesterase has an incredibly fast turnover rate

true

19

nerve gas in small quantities can be a muscle relaxant

false

20

butulism blocks the receptor site for acetylecholine on the muscle

false

21

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

true

22

tissue damage can cause enzymes to leak into the blood

true

23

computerized assay procedures can measure very small quantities of enzymes

true

24

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

true

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