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test vocab.

WordDefinition
Cell the basic unit of structure and function in all living things
Microscope an optical instrument used for viewing very small objects
Organelle any of a number of organized or specialized structures within a living cell.
Cell Wall a layer around a plant cell (protects and supports the cell)
Cytoplasm a gel-like fluid that moves nutrients,proteins,and organelles within a cell
Nucleus the brain of the cell (direct the cells activities)
Mitochondria the powerhouse of the cell (converts energy in food to energy used by a cell)
Chloroplast an organelle in green plants (creates food for a plant cell using energy from sunlight)
Vacuole a storage for a cell (stores water,food,waste products, and other materials)
Selectively Permeable some substances can cross the membrane while others cannot
Diffusion the process by which molecules move from an area of higher concentration to lower concentration
Osmsosis the diffusion of water molecules across a selectively permeable membrane
Endocytosis a form of active transport
Exocytosis a form of active transport
Cell Cycle sequence of events in which the cell grows,prepares for division,and divides to form two daughter cells
Interphase the first stage of the cell cycle
Replication a process in which the cell makes a cope of the DNA in its nucleus before cell division
Mitosis when the cell's nucleus divides into two new nuclei and one set of DNA is distributed into each daughter cell
Cytokinesis the final stage of the cell cycle
Tissue a group of similar cells that perform the same function
Organ a body structure composed of different tissues that work together
Organ System a group of organs that work together
Stimulus any change or signal in the environment that can make an organism react in some way
Response an action or change in behavior that occurs as a result of a stimulus
Gland organs that produce and release chemicals
Hormone the chemical produced by an endocrine
Stress a reaction of a person's body to potentially threatening,challenging, or disturbing events
Created by: ed07129