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25 terms

cells

mrs. hobsons class test 7th grade
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cell theory
all cells come from existing cells, all orginisms live up of one or more cells,a cell is the basic unit of living things.
cell wall
a rigid structure that surrounds the cell membrane and provides support to the cell
cell membrane
thin, flexible barrier around a cell; regulates what enters and leaves the cell
cytoplasm
a jellylike fluid inside the cell in which the organelles are suspended
mitochondria
the organelles in which nutrients are converted to energy
golgi bodies
organelles that package cellular materials and transport them within the cell or out of the cell
lysosome
cell organelle filled with enzymes needed to break down certain materials in the cell
ribosome
makes proteins
nucleus
a part of the cell containing DNA and RNA and responsible for growth and reproduction
nucleur envelope
The double membrane that seperates the nucleus from the cytoplasm
passive transport
The movement of materials through a cell membrane without using energy
active transport
the movement of materials through a cell membrane using energy
diffusion
process by which molecules tend to move from an area where they are more concentrated to an area where they are less concentrated
osmosis
diffusion of molecules through a semipermeable membrane from a place of higher concentration to a place of lower concentration until the concentration on both sides is equal
photsynthesis
a process by which plants change light energy from the sun and use it to make sugar
prokaryotic
cells that do not have a nucleus
eukaryotic
cells that have a nucleus
prokaryotes
cingle celled orginisms
bacteria
doesnt have a nucleus but does have DNA and RNA
cytoskeloten
A protien network inside the cell that gives animal celltheir shape
endoplasmic reticulum
a cell structure that forms a maze of passageways in which proteins and other materials are carried from one part of the cell to another
chloroplasts
organelles that capture the energy from sunlight and convert it into chemical energy in a process called photosynthesis
clorophill
is green pigment in chloroplasts
vesicle
small membrane-bound sac that functions in moving products into, out of, and within a cell
cell
(biology) the basic structural and functional unit of all organisms