biology
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each of the black spaces below before clicking
on it to display the answer.
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| CELL THEORY | a theory in biology that cells are the basic units of structure and function in living organisms.
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| CYTOPLASM | the material or protoplasm within a living cell, excluding the nucleus.
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| ORGENELL | any of a number of organized or specialized structures within a living cell.
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| PROKARYOTIC CELL | are unicellular organisms that lack organelles or other internal membrane-bound structures . Therefore, they do not have a nucleus, but, instead, generally have a single chromosome
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| EUKARYOTIC CELL | A eukaryote is any organism whose cells contain a nucleus and other organelles enclosed within membranes
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| CYTOSKELETON | the cytoplasmic network of protein filaments that plays an essential role in cell movement, shape, and division
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| NUCLEUS | in physical science, an atom's central region, which is made up of protons and neutrons
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| ENDOPLASMIC RETICULUM | a system of membranes that is found in a cell's cytoplasm and that assists in the production, processing, and transport of proteins and in the production of lipids
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| RIBOSOME | a cell organelle composed of RNA and protein; the site of protein synthesis
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| GOLGI APPARATUS |
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| VESICLE | a small cavity or sac that contains materials in a eukaryotic cell; forms when part of the cell membrane surrounds the materials to be taken into the cell or transported within the cell
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| MITOCHONDRION | in eukaryotic cells, the cell organelle that is surrounded by two membranes and that is the site of cellular respiration, which produces ATP
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| VACUOLE | a fluid-filled vesicle found in the cytoplasm of plant cells or protozoans
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| LYSOSOME | a cell organelle that contains digestive enzymes
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| CENTRIOLE | an organelle that is active during mitosis
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| CELL WALL | a rigid structure that surrounds the cell membrane and provides support to the cell
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| CHLOROPLAST | an organelle found in plant and algae cells where photosynthesis occurs
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| CELL MEMBRANE | a phospholipid layer that covers a cell’s surface and acts as a barrier between the inside of a cell and the cell’s environment
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| PHOSPHOLIPID | a lipid that contains phosphorus and that is a structural component in cell membranes
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| FLUID MOSAIC MODEL |
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| SELECTIVE PERMEABILITY |
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| RECEPTOR | a specialized sensory nerve that responds to specific types of stimuli
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| PASSIVE TRANSPORT | the movement of substances across a cell membrane without the use of energy by the cell
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| DIFFUSION | the movement of particles from regions of higher density to regions of lower density
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| CONCENTRATION GRADIENT |
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| OSMOSIS | the diffusion of water or another solvent from a more dilute solution (of a solute) to a more concentrated solution (of the solute) through a membrane that is permeable to the solvent
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| ISOTONIC |
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| HYPERTONIC | describes a solution whose solute concentration is higher than the solute concentration inside a cell
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| HYPOTONIC |
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| FACILITATED DIFFUSION | the transport of substances through a cell membrane along a concentration gradient with the aid of carrier proteins
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| ACTIVE TRANSPORT | the movement of chemical substances, usually across the cell membrane, against a concentration gradient; requires cells to use energy
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| ENDOCYTOSIS | the process by which a cell membrane surrounds a particle and encloses the particle in a vesicle to bring the particle into the cell
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| PHAGOCYTOSIS |
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| EXOCYTOSIS |
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