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Biology 7

bio vocab ch. 7

QuestionAnswer
cell basic unit of life
cell theory fundamental concept of life
cell membrane thin, flexible barrier surrounding cell
nucleus large, membrane- enclosed structure, contains DNA, controls cell
eukaryotes enclose DNA in nuclei
prokaryotes doesn't enclose DNA in nuclei
cytoplasm outside nucleus
organelles "little organs", specialized organs
vacuoles sac like, membrane- enclosed structures
lysosomes small organelles filled with enzymes
cytoskeleton protein filaments giving eukaryote cells shape and internal organization
centrioles organize cell division
ribosomes small particles of RNA and protein in cytoplasm
endoplasmic reticulum internal membrane system in eukaryotic cells
golgi body organelle appearing as stack of flattened membranes
chloroplasts biological equivalent of solar power plants
mitochondria power plants of cell
cell wall supporting layer around membrane
lipid bilayer gives cell membrane flexible structure, forming strong barrier between cell and surroundings
selectively permeable only allows some substances to pass through
diffusion driving force behind movement of many substances across cell membrane
facilitated diffusion molecules unable to directly diffuse across membranes passing through special protein channels
aquaporins water channels allowing water to pass through
osmosis diffusion of water through selectively permeable membrane
isotonic same strength
hypetronic above strength
hypotonic below strength
osmotic pressure net movement of water in or out of cell
homeostasis relatively constant internal physical and chemical conditions
tissue group of similar cells performing particular function
organ groups of tissue working together
organ system group of organs working together to perform specific function
receptor specific protein in a cell with shaping fitting to that of a specific molecule manager
Created by: khutsell
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