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a group of similar cells that work together to perform a specific job in the body


a combination of two or more tissues that work together to perform a specific function in the body

organ system

a group of organs working together to perform body functions


anything that an independently carry out life processes


made of a single cell


made of many cells


a group of individuals of the same species that live together in the same area at the same time


all of the populations of different species that live and interact in an area


a community of organisms and their nonliving environment

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


structures within a cell, sometimes surrounded by a membrane


cellular fluid surrounding a cell's organelles


membrane-covered organelle found in eukaryotic cells that contains a cell's DNA and serves as a control center for the cell


describes a cell that does not have a nucleus or any other membrane-covered organelles; also called bacteria


describes a cell that has a nucleus


extremely small single-celled organisms without a nucleus; prokaryotic cells

cell wall

a structure that surrounds the cell membrane of some cells and provides strength and support to the cell membrane


a small organelle in cells where proteins are made from amino acids

endoplasmic reticulum

a membrane-covered cell organelle that produces lipids, breaks down drugs and other substances, and packages proteins for delivery out of the cell


cell organelles surrounded by two membranes that break down food molecules to make ATP


an organelle found in plant and algae cells where photosynthesis occurs

Golgi complex

the cell organelle that modifies, packages, and transports materials out of the cell


a membrane-covered compartment in a eukaryotic cell that forms when part of the cell membrane surrounds an object and pinches off


a large membrane-covered structure found in plant cells that serve as storage containers for water and other liquids


a special vesicle in cells that digests food particles, wastes, and foreign invaders

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