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15 Cards in this Set

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Cell theory
- All living things are composed of one or more cells
- In organisms cells are the basic unit of structure and function
- Cells are produced only from existing cells
Cell membrane
or plasma membrane
seperates the cell's contents with material outside the cell and regulates what moves in and out of the cell, maintains homeostasis.
cytoplasm
everything inside the cell's membrane exept the cell's genetic material.
ribosomes
the structures on which protiens are made
prokaryotic
first cells that lived 3.5 billion years ago, they are single celled organisms that lack internal membrane bound organs.
eukaryotic
first cells with internal structures that are larger the bacteria and lived 1.5 billion years ago
nucleus
a membrane bound compartment that houses DNA
organelles
subcellular structure that has a special function
atoms
make up all living and non living things
electrons
carry a negative charge and protons a positive
element
a substance that can't be broken down into anyother substance by ordinary chemical means
ions
particles with an unequal number of electrons and protons
compound
a group of atoms held together in a chemical bond
molecule
a group of atoms held together by covalent bonds
ionic bond
The force of attraction between a positive and negative ion