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Biological catalyst made of amino acids.


Reactant an enzyme catalyzes

Active Site

structure on the enzyme


The molecules needed for a chemical reaction to occur


Molecules that are made when a chemical reaction is over

Activation Energy

The amount of energy needed for a reaction to occur.

Heat of Reaction

The difference in energy between the reactants and products of a chemical reaction


a reaction that has a "-" heat of reaction b/c it releases more energy that it stores


a reaction that has a "+" heat of reaction and stores more energy than it releases.


Speeds up a chemical reaction

Variables that effect enzyme reaction rate

Temperature, pH, enzyme concentration, substrate concentration


enzyme becomes "inactive" due to changes in the active site structure

enzyme specificity

enzyme only bonds to one substrate due to shape of active site


(adenosine triphosphate) main energy source that cells use for most of their work


ATP is converted to this and it releases energy that your cells use


Process by which some organisms, such as certain bacteria, use chemical energy to produce carbohydrates


Plants use the sun's energy to convert water and carbon dioxide into sugars


An organism that can make its own food.


An organism that makes its own food


An organism that eats other organisms


An organism that cannot make its own food.

food chain

is the transfer of food energy from one source to the next


A consumer that eats only plants.


An animal that eats other animals


A consumer that eats both plants and animals.


organism that feeds on plant and animal remains and other dead matter


An organism that breaks down wastes and dead organisms

trophic level

Each step in a food chain or food web

food web

A diagram that shows the feeding relationships between organisms in an ecosystem.


A measure of the total dry mass of organisms within a particular region

primary producer

Organisms in the first trophic level, such as plants and algae.

primary consumer

An herbivore; an organism in the trophic level of an ecosystem that eats plants or algae

secondary consumer

An organism that eats primary consumers

teritary consumer

An animal that feeds on secondary consumers in a food chain.

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