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biology chapter 7
vocab
19
Biology
9th Grade
09/24/2009

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Term

cell

 

Definition
a collection of living matter enclosed by a barrier that separates the cell from its surroundings; the basic unit of all forms of life
Term
cell theory
Definition
  • all living things are composed of cells
  • cells are the basic unit of struture & function in all living things
  • new cells are produced from existing cells
Term
cell membrane
Definition
a thin flexable barrier around the cell; regulates what enters and leaves the cell
Term
cell wall
Definition
a strong layer around the cell membrane in plants algae & some bacteria
Term

nucleus

 

Definition
the center of the atom which contains the protons and the neutrons;nin cellc, large structure inside some cells that contain the cell's DNA & controls the cell's activities
Term
cytoplasm
Definition
material inside the cell membrane NOT INCLUDING THE NUCLEUS
Term
PROKARYOTE
Definition
single celled micro-organism thant lacks a nucleus
Term
eukaryote
Definition
organism whos cells contain nuclei
Term
organelle
Definition
specialized structure that performs celluar functions within a eukaryotic cell
Term
nucleolus
Definition
small dense region within most nuclei; starts assembly of ribosomes
Term
cytoskeleton
Definition
network of protien filaments within some cells that help the cell maintain the shape & is involved in cell movement
Term
chloroplast
Definition
organelle in plant cell that uses sunlightto make energy-rich food through photosynthesis
Term
E.R.
Definition
internal membrane system n cells where components of the cell membrane are asembled and some protiens r modified
Term
golgi apparatus
Definition

stack in membranes n the cell w

hich enzymes attach to carbs & lipids to proteins

Term
microfilament
Definition
long,thin fiber that functions in the movement and support of the cell
Term
lysosome
Definition
cell organelle filled with enzymes needed to break down certain materials in the cell
Term
microtubule
Definition
hollow tube of protein that maintains cell shape and can also serve as a track along which organelles are moved
Term
organ
Definition
group of tissues that work to perfom closely related functions
Term
organ system
Definition
group of organs that work together
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