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| Basic unit of all forms of life |
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| fundamental concept of biology that states that all living things are composed of cells; that cells are the besic units of structure and function in living things; and that new cells are produced from existing cells |
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| thin, flexible barrier that surrounds all cells; regulates what enters and leaves the cell. |
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| the center of an atom, which contains the protons and neutrons (34); in cells, structure that contains the cell's genetic material in the form of DNA |
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| organism whose cells contain a nucleus |
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| unicellular organism that lacks a nucleus |
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| in eukaryotic cells, all cellular contents outside the nucleus; in prokaryotic cells, all of the cells' contents |
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| specialized structure that performs important cellular functions within a cell |
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| cell organelle that stores material such as water, salts, proteins,and carbohydrates. |
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| cell organelle that breaks down lipids, carbohydrates, and proteins into small molecules that can be used by the rest of the cell |
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| network of protein filaments in a eukaryotic cell that gives the cell its shape and internal organization and its involved in movement |
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| structure in an animal cell that helps to organize cell division |
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| cell organelle consisting of RNA and protein found throughout the cytoplasm in a cell; the site of protein |
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| internal membrane system found in eukaryotic cells; place where lipid components of the cell membrane are assembled |
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| organelle in cells that modifies, sorts, and packages proteins and other materials from the endoplasmic reticulum for storage in the cell or release outside the cell |
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| organelle found in cells of plants and some other organisms that captures the energy from sunlight and converts it into chemical energy |
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| cell organelle that converts the chemical energy stored in food into compounds that are more convenient for the cell use |
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| strong, supporting layer around the cell membrane in some cells |
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| flexible double-layered sheet that makes up the cell membrane and forms a barrier between the cell and its surroundings |
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| property of biological membranes that allows some substances to pass across it while others cannot; also called semipermeable membrane |
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| process by which particles tend to move from an area where they are more concentrated to an area where they are less concentrated |
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| process of diffusion in which molecules pass across the membrane through cell membrane channels |
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| water channel protein in cell |
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| diffusion of water through a selectively permeable membrane |
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| when comparing two solutions, the solution with the greater concentration of solutes |
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| when the concentration of two solutions is the same |
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| when comparing two solutions, the solution with the lesser concentration of solutes |
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| pressure that must be applied to prevent osmotic movement across a selectively permeable membrane |
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| relatively constant internal physical and chemical conditions that organisms maintain |
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| group of similar cells that perform a particular function |
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| group of tissues that work together to perform closely related functions |
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| group of organs that work together to perform a specific function |
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| on or in a cell, a specific protein to whose shape fits that of a specific molecular messenger, such as a hormone |
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