Chapter 3 - Enzymes Flashcards

1
Q

enzyme

A

an organic molecule, typically a protein, that catalyses (speeds up) specific reactions

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2
Q

catalyst

A

a substance capable of increasing the rate of a reaction without being used up

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3
Q

catalyse

A

to increase the rate of a reaction

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4
Q

substrate

A

the reactant of a reaction catalysed by an enzyme

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5
Q

reactant

A

a molecule that undergoes a transformation into a product. When enzymes are involved, the reactant is called a substrate

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6
Q

product 

A

the transformed molecule created in a reaction

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7
Q

active site

A

the part of an enzyme where the substrate binds

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8
Q

enzyme-substrate complex

A

the structure formed when an enzyme and substrate are bound together

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9
Q

conformational change 

A

a change in the three-dimensional shape of macromolecules such as proteins

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10
Q

activation energy

A

the energy required to initiate a reaction

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11
Q

collision theory

A

explanation of chemical reactions that states that in order to react molecules must hit one another

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12
Q

biochemical pathway

A

a series of enzyme-catalysed biochemical reactions in which the product of one reaction becomes the substrate of the next reaction. Also known as a metabolic pathway

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13
Q

optimal

A

the point at which for a given condition (e.g. temperature), the maximum function of an enzyme occurs. Also known as optimum

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14
Q

denature

A

the disruption of a molecule’s structure by an external factor such as heat

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15
Q

conformational change

A

a change in the three-dimensional shape of macromolecules such as proteins

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16
Q

saturation point

A

the point at which a substance (e.g. an enzyme) cannot receive more of another substance (e.g. a substrate)

17
Q

limiting factor

A

a factor that
prevents the rate of reaction from
increasing

18
Q

limiting reagent

A

a reactant that
prevents the rate of reaction from
increasing

19
Q

enzyme inhibitor

A

a molecule that
binds to and prevents an enzyme
from functioning

20
Q

competitive inhibition

A

the hindrance of an enzyme
by blocking the active site and
preventing the substrate
from binding

21
Q

non-competitive inhibition

A

the hindrance of an enzyme by
binding to an allosteric site and
changing the shape of the active
site to prevent the substrate from
binding

22
Q

allosteric site

A

a region on an
enzyme that is not the active site

23
Q

reversible inhibition

A

enzyme inhibition that involves
weaker bonds that can be
overcome

24
Q

irreversible inhibition

A

enzyme inhibition that involves
stronger bonds that cannot be
broken

25
biochemical pathway
a series of enzyme-catalysed biochemical reactions in which the product of one reaction becomes the substrate of the next reaction. Also known as a metabolic pathway
26
cofactor
any organic or inorganic molecule, such as a coenzyme or metal ion, that assists enzyme function
27
coenzyme
a non-protein organic cofactor that assists enzyme function. They release energy and are recycled during a reaction
28
ATP 
adenosine triphosphate, a high energy molecule that, when broken down, provides energy for cellular processes
29
ADP
adenosine diphosphate, the unloaded form of ATP
30
anabolic reaction
two or more smaller molecules combine to form a larger one (i.e. building things up), uses energy
31
catabolic reaction
larger molecule turning into two or more smaller molecules (i.e. breaking things down), releases energy