Cell membrane and transport Flashcards
cell theory
smallest unit of life, some organisms are unicellular and some are multicellular. all cells come from pre-existing cells
cells
basic unit of life, all living things are made up of cells.
cells in a multicellular organism..
may be specialized to do different jobs, are organized into tissue, tissue make up organs
-organism are grouped into organ systems which make up organisms.
jobs of cells
make energy (need for all activities), make proteins (do all work, need lots of them), make more cells (for growth, to replace old/damaged ones)
All cells have..
cell membranes, DNA/genetic material, cytoplasm, ribosomes,
eukaryotes
cells have membrane bound organelles, including a nucleus
prokaryotes (bacteria)
cells have no nucleus or membrane bound organelles, free DNA, generally much smaller then eukaryotes, they still grow, reproduce, move, respond