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ajh science exam 7th

what is a cell membrane? protective outer covering of all cells that is made up of a double layer of fat like molecules and regulates the interaction between the cell and the enviroment
what is cytoplasm? constantly moving, gel-like mixture inside the cell membrane that comtains heredity materials
what is a cell wall? rigid structure that encloses, supports, and protects the cell of plants
what is an organelle? structure in the cytoplasm of a eukaryotic cell that can act as a storage site, processes enrgy, move materials, or manufacture substances
what is a nucleus? organelle that controls all the activities of a cell and contains hereditary material made of proteins and D.N.A
what is cholorplast? green,chlorophyll-contained, plant cell organelle that converts sunlight, carbondioxide, and water into sugar
what is a mitochondrion? cell organelle that breaks down lipids and carbonhydrates and releases energy
what is a ribosome? small structure in which cells make their own protein
what is E.R.? cytoplasmic organelle that moves materials around in a cell and is made up of a complex series of folded membranes
what is a glogi body? organell that packages cellular materials and transports them within the cell or out of it
what is a tissue? a group of similar cells that work together to do one job
what is a organ? structure, such as teh heart, made up of different types of tissue that all work together
what is the cell theory? states that all organisms are amde up of one or more cells, the cell is the most basic unit of life, and all the cells come from other cells
what is a virus? a strand of hereditary material surrounded by a protein coating
what is a host cell? living cell in which a virus can actively reproduce or in which a virus can hide until activated by enviromental stimuli
what is a mixture? a combination of substances in which individual substances retain their own properties
what is a organic compound? contains carbon and hydrogen and usally are associated with living things
what is a enzyme? regulates nearly all chemical reactions in a cell
what is a inorganic compound? are made from elements other than carbon
what is passive transport? the movement of substances through the cell membrane without the input of energy
what is diffusion? random movement of molecules from an area where there is relatively more of them into an area where there is relatively fewer of them
what is equilibruim? reached and diffusion stops
what is osomosis? diffusion of water through a cell membrane
what is active transport? an input of energy is required to move materials through a cell membrane
what is endocytosis? process of taking substances into a cell by surronding it with a cell membrane
what is exocytosis? contains a vesicel may be released by the cell
what is a metabolism? total of all chemical reactions in an organism
what is photosynthesis? producers use light energy to make sugars, which can be used as food
what os respiration? chemical reactions occur that break down food molecules into simpler substances and release their stored energy
what is fermentation? to release some of the energy stroed in glucose molecules
Created by: marcrobertdillon