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Biology Ch. 4

Cell Structure and Function

TermDefinition
cell the smallest unit that can perform all life processes; cells are covered by a membrane and contain DNA and cytoplasm
cell theory the theory that states that all living things are made up of cells, that cells are the basic units of organisms, that each cell in a multicellular organism has a specific job, and that cells come only from existing cells
plasma membrane or cell membrane, the cell's outer boundary
cytoplasm the region of the cell within the membrane that includes the fluid, the cytoskeleton, and all of the organelles except the nucleus
cytosol the soluble portion of the cytoplasm, which includes molecules and small particles, such as ribosomes, but not the organelles covered with membranes
nucleus in physical science, an atom's central region, which is made up of protons and neutrons
prokaryote a single-celled organism that does not have a nucleus or membrane-bound organelles; examples are archaea and bacteria
eukaryote an organism made up of cells that have a nucleus enclosed by a membrane, multiple chromosomes, and a mitotic cycle
organelle one of the small bodies that are found in the cytoplasm of a cell and that are specialized to perform a specific function
tissue a group of similar cells that perform a common function
organ a collection of tissues that carry out a specialized function of the body
organ system system of organs
phospholipid bilayer a double layer of phospholipids that makes of plasma and organelle membranes
chromosome in a eukaryotic cell, one of the structures
Created by: alicemb00