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Energy
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Energy
Flows in one direction
Potential energy
stored energy
Car at top of hill
Kinetic energy
energy in motion
Car rolling downhill
Laws of thermodynamics
First Law
Total
amount of energy in the universe is constant. Energy can change form and be transferred.
Second Law
Energy changes from a more useful to a less useful form. It becomes increasingly more random.
Exergonic Reactions
A chemical reaction where energy is
released
as a byproduct of the reaction.
AB ---------} A + B +
energy
Exergonic reactions
release
energy!
Endergonic Reactions
Chemical reactions that require an
input
of energy to make the reaction go.
A + B + energy -------------} AB
Endergonic reactions
need
energy!
ATP and reactions
The energy
released
from an exergonic reaction is used to run an endergonic reaction.
Exergonic reaction
ATP --------} ADP + P + energy
Endergonic reaction
ADP + P + energy--------} ATP
Metabolism
A series of chemical reactions making up a pathway.
The pathway may be linear, cyclic or a combination.
Metabolic reactions
- Most metabolic reactions have a
small
energy difference-
- This means that most are
reversible.
- Direction of reaction depends on concentrations of reactants and products.
Reactants are located on the flat end of the arrow and products on the pointy end!!
Author
spizzlo
ID
172169
Card Set
Energy
Description
Biology Energy notes
Updated
2012-09-20T15:41:18Z
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