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Cells
What is inside.
38
Biology
10th Grade
10/22/2010

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Term
diffusion
Definition
Higher consentration to lower consentration
Term
cell wall
Definition
the rigid, porous outer layer of a plant cell
Term
centriole
Definition
bundle of microtubles that helps organize the movement of chromosomes during cell division
Term
chloroplast
Definition
an organelle that converts the radiant energy of the sun into chemical energy through the proccess of photosynthesis
Term
cytoplasm
Definition
a jelly-like substance composed mainly of water, occupying most of the space between the cell membrane and the nucleus
Term
endoplasmic reticulum
Definition
a network of passageways in which chemical compound are manufactured, processed, and transported
Term
golgi apparatus
Definition
a stack of membranes that collects, modifies, and packages chemical compounds
Term
lysosome
Definition
a small sac that contains digestive chemicals
Term
mitochondia
Definition
organelles that, using oxygen, convert nutrients into energy tha can be used by the cell (powerhouse of a cell)
Term
nuclear envelope
Definition
a double-layered membrane that surrounds and protects the nucleus
Term
nucleolus
Definition
a small body in the nuclus where ribosomes are synthesized
Term
nucleus
Definition
a round body in the center of the cell that contains DNA and directs the cell's activities
Term
organelle
Definition
a cell structure that performs a specific function
Term
plasma membrane (cell membrane)
Definition
a double-layered membrane that surrounds the cells, it regulates what enters and leaves the cell
Term
plastid
Definition
small structure that can store food(leucoplast) or pigment(chromoplast)
Term
ribosome
Definition
tiny structure where proteins are synthesized
Term
vacuole
Definition
sac that stores water, nutrients, and other chemicals. the large ____ is found in plant cells help the cells maintain their shape
Term
vesicle
Definition
small package of nutrients or proteins created by the golgi apparatus
Term
osmosis
Definition
the diffusion of water through a selectively permeable membrane
Term
active transport
Definition
cells somethimes move materials in the opposite direction- against a concentration difference
Term
permeable membranes
Definition
allows things through
Term
impermeable membrane
Definition
nothing is let through
Term
selectively permeable membrane
Definition
allows somethings through but not everything
Term
cell theory
Definition
1. all living things are composed of cells 2. cell are the basic unit of structure and function in living things 3. new cells are produced from existing cells
Term
eukaryotes
Definition
animals, plants, fungi and protists cells that contain a nucleus usually more complex (many organelles) genetic material keep seperate from the rest of the cell
Term
prokaryotes
Definition
all bacteria have genetic material but NO nucleus simple (small orgainism)
Term
equilibrium
Definition
=goal= concentragton is the same throughout
Term
isotonic
Definition
same throughout
Term
hypertonic
Definition
very concentrated more solvent cells will shrink water moves out of cell
Term
hypotonic
Definition
lots of water cells will swell water moves into cell
Term
endocytosis
Definition
brings material into cell by folding around it
Term
exocytosis
Definition
brings material out of cell
Term
phagocytosis
Definition
cell eating- brings in paticles particles put in vacuole
Term
pinocytosis
Definition
cell drinking- brings in liquid to vacuoles
Term
unicellular organism
Definition
1 celled one cell controls all life activities- simple
Term
multicellular organism
Definition
many celled cells specialized to perform certain tasks (cell specialization) - cells are different sized and shape - cells have different function
Term
levels of organization
Definition
1. cells 2. tissues 3. organs 4.organ system 5 organism
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