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Biochem topnotch > Enzymes > Flashcards

Enzymes Flashcards

1
Q

Protein catalysts that increase the velocity of a chemical reaction and are not consumed during the reaction they catalyze

A

Enzymes

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2
Q

Physically distinct versions of a given enzyme each of which catalyze a the same reaction

A

Isosymes

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3
Q

Catalyze a the joining together of two molecules coupled to the hydrolysis of ATP

A

Ligamentum

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4
Q

Catalyze geometric or structural changes within a molecule

A

Isomer ashes

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5
Q

Catalyze cleavage of C-C, C-O, C-N and others by atom elimination leaving double bonds

A

Leases

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6
Q

Tue or False

Enzymes are consumed in the reaction it catalyzes

A

False

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7
Q

Cofactor distinguished by their tight, stable incorporation into a protein’s structure by covalent or noncovalent forces?

A

Prosthetic group

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8
Q

Not proteins
inorganic
bind in a transient dis sociable manner either to the enzyme or the substrate
Required for function
Ex. Iron in hemoglobin, copper in cytochrome oxidase

A

Cofactors

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9
Q

Serves as recyclable shuttles or group transfer agents that transport many substrates from their point of generation to their point of utilization, organic cofactors

A

Coenzyme

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10
Q

Enzyme only

Enzyme plus cofactors

A

Apoenzyme

Holoenzyme

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11
Q

True or false

Effectors are require for function

A

False

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12
Q

High Km means the substance has low or high affinity

A

Low

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13
Q

True or false Low Km means the substance has high substrate affinity

A

TRUE

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14
Q

Above the Km you follow the

Zero order or first order mechanics?

A

Zero order

Substrate is not affected by Substrate

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15
Q

Temperature increases/decreases reaction rate

A

Increases

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16
Q 
Competitive inhibition 
Mechanism:
Reversal:
km:
Vmax:
A

Mechanism: inhibitor competes for binding site
Reversal: increase substrate concentration
km: increased
Vmax: not changed

17
Q 
Noncompetitive inhibition 
Mechanism:
Reversal:
km:
Vmax:
A

Mechanism: binds to enzyme other than on the active site
Reversal: increase effectivity
km: not changed
Vmax: lowered

18
Q

What remains the same in
Competitive inhibition
Non-competitive inhibition

A

Competitive inhibition: maximum velocity of the reaction: Vmax, Km is increased
Non-competitive inhibition: Km is the same, Vmax is lowered

19
Q

Increased enzyme in Wilson’s disease

A

Ceruloplasmin

20
Q

Increased enzymes in MI

A

AST,ALT, CK, LDH

Biochem topnotch (3 decks)

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