Lecture 8 Flashcards Preview

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Flashcards in Lecture 8 Deck (22):
1

activation energy

The energy required to contort the reactant molecules so the bonds can break

2

active site

a restricted region of the enzyme that actually binds to the substrate

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allosteric site

a specific receptor on the enzyme that is not the active site

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anabolic pathway

consume energy to build complicated molecules from simpler compounds

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ATP

Adenosine Tri Phosphate. Used as primary source of energy.

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catabolic pathway

release energy by breaking down complex molecules to simpler compounds

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catalyst

a chemical agent that changes the rate of a reaction without being consumed by the reaction

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competitive inhibitor

takes the place of a substrate in the active site

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endergonic reaction

one that absorbs free energy from its surroundings. Endergonic reactions store energy

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energy

The capacity to cause change, especially to do work

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entropy

Disorder; Chaos

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exergonic reaction

Expels Energy

13

feedback inhibition

One of the common methods of metabolic control is?feedback inhibition?in which a metabolic pathway is turned off by its end product

14

first law of thermodynamics

? Energy can be changed from one form to another (can be transferred and transformed), but it cannot be created or destroyed.
? However, energy cannot be created or destroyed
? Example: Plants transform light to chemical energy; they do not produce energy.

15

kinetic energy

is the energy of motion, energy that is actually doing work

16

metabolism

Cells carry out thousands of chemical reactions
? The sum of these reactions constitutes cellular metabolism
? cellular metabolism = add up all the chemical activities, the reactions, that occur in a cell and the total is cellular metabolism
? The totality of an organism?s chemical reactions is called metabolism.
? A cell?s metabolism is an elaborate road map of the chemical reactions in that cell.

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noncompetitive inhibitor

alters an enzyme?s function by changing its shape

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phosphorylation

Adding Phosphate. (ATP production)

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potential energy

Stored Energy

20

second law of thermodynamics

states that every energy transformation must make the universe more disordered
? each time energy is changed some of it is lost to the system
? Energy changes are not 100% efficient
-Energy conversions increase disorder, or entropy
- Some energy is always lost as heat

21

substrate

a reactant which binds to an enzyme

22

thermodynamics

the study of energy transformations