Chapter 6 Flashcards

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0
Q

A specific molecule is altered in a series of defined steps, resulting in a product.

A

Metabolic pathway

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1
Q

The totality of an organism’s chemical reactions.

A

Metabolism

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2
Q

When complex molecules are broken down into simpler molecules, releasing energy.

A

Catabolic pathway

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3
Q

When complicated molecules are formed from simpler ones, absorbing energy.

A

Anabolic pathways

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4
Q

The study of how energy flows through living organisms.

A

Bioenergetics

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5
Q

The capacity to do work.

A

Energy

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6
Q

Energy that can be associated with the relative motion of objects.

A

Kinetic energy

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7
Q

Energy associated with the random movement of atoms or molecules.

A

Thermal energy

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8
Q

Thermal energy in transfer from one object to another.

A

Heat

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9
Q

Energy that matter possesses because of its location or structure.

A

Potential energy

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10
Q

The potential energy available for release in a chemical reaction.

A

Chemical energy

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11
Q

The study of the energy transformations that occur in a collection of matter.

A

Thermodynamics

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12
Q

Says that energy can be transferred and transformed, but it cannot be created or destroyed.

A

First law of thermodynamics

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13
Q

A measure of randomness, or disorder.

A

Entropy

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14
Q

Says that every energy transfer or transformation increases the entropy of the universe.

A

Second law of thermodynamics

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15
Q

An event that can occur without an input of energy.

A

Spontaneous process

16
Q

The portion of a system’s energy that can perform work when temperature and pressure are uniform throughout the system, as in a living cell.

A

Free energy

17
Q

The net release of energy.

A

Exergonic reaction

18
Q

Absorbs energy from its surroundings.

A

Endergonic reaction

19
Q

The use of an exergonic process to drive an endergonic one.

A

Energy coupling

20
Q

Contains a ribose sugar, a nitrogenous base adenine, and three phosphate groups. One of the nucleoside triphosphates used to make RNA.

A

ATP (adenosine triphosphate)

21
Q

A molecule with a phosphate group covalently bonded to it, making it more reactive.

A

Phosphorylated intermediate

22
Q

A macromolecule that acts as a catalyst.

A

Enzyme

23
Q

A chemical agent that speeds up a reaction, without being consumed by the reaction.

A

Catalyst

24
Q

The energy required to start a reaction.

A

Activation energy

25
Q

The reactant an enzyme acts on.

A

Substrate

26
Q

A temporary complex formed when an enzyme binds to its substrate(s).

A

Enzyme-substrate complex

27
Q

A pocket in the enzyme where the bonding of the substrate takes place.

A

Active site

28
Q

This brings chemical groups of the active site into positions that enhance their ability to catalyze the chemical reaction.

A

Induced fit

29
Q

Any nonprotein molecule or ion that is required for the proper functioning of an enzyme.

A

Cofactors

30
Q

An organic molecule serving as a cofactor.

A

Coenzyme

31
Q

A substance that reduces the activity of an enzyme by entering the active site in place of a substrate, whose structure it mimics.

A

Competitive inhibitors

32
Q

A substance that reduces the activity of an enzyme by binding to a location remote from the active site, changing the enzyme’s shape so that the active site no longer effectively catalyzes the conversion of substrate to product.

A

Noncompetitive inhibitors

33
Q

The term used to describe any case in which a protein’s function at one site is affected by the binding of a regulatory molecule to a separate site.

A

Allosteric regulation

34
Q

When a substrate molecule binding to one active site in a multisubunit enzyme triggers a shape change in all the subunits, thereby increasing catalytic activity at the other active sites.

A

Cooperativity

35
Q

A metabolic pathway is switched off by the inhibitory binding of its end product to an enzyme that acts early in the pathway.

A

Feedback inhibitation