AP Biology unit 3 chapter 1

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21 Terms

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Metabolism

All chemical reactions in an organism

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Metabolic pathways

Services of chemical reactions that either build complex molecules or break down complex molecules

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Catabolic pathways

Pathways that release energy by breaking down complex molecules into simpler compounds

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Anabolic pathways

Pathways that consume energy to build complicated molecules from simpler compounds

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Kinetic energy

Energy associated with motion

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Thermal energy

Energy associated with the movement of atoms or molecules

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Potential energy

Stored energy

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Chemical energy

Potential energy available for release in a chemical reaction

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Thermodynamics

The study of energy transformations in matter, the laws apply to the universe as a whole

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1st law of thermodynamics

Energy cannot be created or destroyed. Energy can be transferred or transformed

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2nd law of thermodynamics

Energy transformation increases the entropy (disorder) of the universe, During energy transfers or transformations, some energy is unusable and often lost as heat

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Free energy

Determines the likelihood of reactions in organisms or if the reactions are energetically favorable

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Exergonic reactions

Reactions that release energy, reaction is spontaneous

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Endergonic reactions

Reactions that absorb energy, reaction is not spontaneous and obsorbs free energy

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Cells perform 3 kinds of work

  • Mechanical- movement

  • Transport- pumping substances across membranes

  • Chemical- synthesis of molecules

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Phosphorylation

The released phosphate moves to another molecule to give energy

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Allosteric enzymes

Has two binding sites (active and allosteric). Allosteric site regulates the on and off of the enzyme

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Allosteric regulation

Molecules bind (noncovalent interactions) to an allosteric site which results in the change of the shape and function of the active site. May result in inhibition or stimulation

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Allosteric activator

Substrate binds to allosteric site and stabilizes the shape of the enzyme so that the active site remains open

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Allosteric inhibitor

Substrate binds to allosteric site and stabilizes the enzyme shape to that the active sites are closed

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Cooperativity

Substrate binds to one active site on an enzyme with one or more active site which stabilizes the active form