Ch. 6 - An Introduction to Energy, Enzymes, and Metabolism Flashcards

1
Q

ability to cause change or do work

A

Energy

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2
Q

energy associated with movement

A

Kinetic Energy

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3
Q

the energy that a substance or object possesses due to its structure or location

A

Potential Energy

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4
Q

the energy that is stored in atoms and in the bonds between atoms

A

Chemical Potential Energy

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5
Q

a form of electromagnetic radiation that is visible to the eye; packaged in photons.

A

Light Energy

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6
Q

the transfer of kinetic energy from one object to another or from an energy source to an object; viewed as kinetic energy that can be transferred due to a difference in temperature between two objects or locations

A

Heat Energy

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7
Q

the energy possessed by an object due to its motion or its position relative to other objects

A

Mechanical Energy

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8
Q

the movement of charge or the separation of charges can provide energy; a difference in ion concentration across a membrane creates an electrochemical gradient, which is a source of potential energy

A

Electrical/Ion Gradient Energy

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9
Q

energy cannot be created or destroyed; energy can be transferred and can be transformed from one type to another

A

First Law of Thermodynamics

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10
Q

any energy transfer or transformation from one form to another increases the degree of disorder of a system

A

Second Law of Thermodynamics

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11
Q

measure of randomness of molecules in a system

A

Entropy

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12
Q

total energy of a system

A

Enthalpy

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13
Q

usable energy - the amount of energy that is available and can be used to promote change or do work

A

Free Energy

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14
Q

free energy is released during product formation; spontaneous

A

Exergonic

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15
Q

positive free-energy change requiring the addition of free energy; not spontaneous

A

Endergonic

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16
Q

a phosphate is directly transferred from ATP to glucose

A

Phosphorylation

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17
Q

an agent that speeds up the rate of a chemical reaction without being permanently changed or consumed by it

A

Catalyst

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18
Q

an initial input of energy needed to overcome the repulsion of the electrons in the outer shells of atoms repelling each other

A

Activation Energy

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19
Q

when the original bonds have stretched to their limit; the chemical reaction can readily proceed to the formation of products

A

Transition State

20
Q

location in an enzyme where the chemical reaction takes place

A

Active Site

21
Q

reactant molecules that bind to an enzyme at the active site and participate in the chemical reaction

A

Substrates

22
Q

the binding between enzymes and substrates

A

Enzyme-Substrate Complex

23
Q

conformational changes cause the substrates to bind more tightly to the enzyme

A

Induced Fit

24
Q

maximal rate when the enzyme is saturated with substrate

25
substrate concentration at which the velocity is half its maximal value
Km
26
molecules that bind non-covalently to the active site of an enzyme and inhibit the ability of the substrate to bind
Competitive Inhibitors
27
decreasing the Vmax for the reaction without affecting the Km; binds non-covalently to an enzyme at a location outside the active site and inhibits the enzyme's function
Noncompetitive Inhibitors
28
usually bind covalently to an enzyme to inhibit its function
Irreversible Inhibitors
29
small molecules that are permanently attached to the surface of an enzyme and aid in enzyme function
Prosthetic Groups
30
temporarily bind to the surface of an enzyme and promote a chemical reaction; ex. inorganic ions
Cofactors
31
organic molecules that temporarily bind to an enzyme and participate in the chemical reaction that the enzyme catalyzes, but are left uncharged when the reaction is completed
Coenzymes
32
chemical reactions are coordinated with each other and often occur in a series of steps with each step catalyzed by a specific enzyme
Metabolic Pathway
33
breakdown of larger molecules into smaller ones; often exergonic
Catabolic Reaction
34
involves the synthesis of larger molecules from smaller precursor molecules; usually endergonic
Anabolic Reaction
35
directly used to drive endergonic reactions in cells; ex. molecules like ATP; store energy from when cells break covalent bonds in organic molecules
Energy Intermediates
36
occurs when an enzyme directly transfers a phosphate from an organic molecule to ADP, thereby making ATP
Substrate-Level Phosphorylation
37
energy stored in an ion electrochemical gradient is used to make ATP from ADP & P
Chemiosmosis
38
the removal of one or more electrons from an atom or molecule
Oxidation
39
addition of one or more electrons to an atom or molecule
Reduction
40
when an atom or molecule is oxidized the electron that is removed must be transferred to another atom or molecule, which becomes reduced
Redox Reaction
41
slowest step of the metabolic pathway; if this step is inhibited or enhanced, such changes will have the greatest influence on the formation of the final product of the metabolic pathway
Rate-Limiting Step
42
time it takes for 50% of a specific type of molecule in a cell to be broken down and recycled
Half-life
43
enzymes that cleave the bonds between adjacent amino acids
Proteases
44
primary pathway for protein degradation in archaea and eukaryotic cells occurs via a protein complex; 4 stacked rings with 7 protein subunits each
Proteasome
45
cellular material becomes enclosed in a double membrane
Autophagy
46
when a double membrane is formed from a tubule that elongates and eventually wraps around the organelle
Autophagosome