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15 Cards in this Set

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element
any substance that cannot be broken down into simpler substances
atom
the smallest unit of an element
compound
when to or more elements combine to form a ______.
molecule
the smallest unit of most compounds
enzyme
a type of protien that speeds up chemical reactions in a living thing
without _____, most chemical reactions within _______ could not take place.
water; cells
name 3 meathods that substances that can move into and out of a cell
diffusion
osmosis
active transport
diffusion
the process by which molecules tend to move from an area of higher concentration to an area of lower concentration
osmosis
the diffusion of water molecules through a selectively permeable membrame
passive transport
the movement of materials throurgha cell membrane without using energy
active transport
is the movement of materials througha cell membrane using energy
name the main difference between passive transport and active transport
is that active transport requires the cell to use enery while passiv etransport does not
chlorophyll
the main pigment found in cloroplasts
photosyntheisis

what happens during it?
the process in which a cell captures the energyin sunlight and uses it to make food
------------------------------ converts carbon dioxide and water into sugers and oxygen
pigments
colored chemical compounds that absorb light