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a microscope that uses a beam of visible light passing through one or more lenses to magnify an object
scanning tunneling microscope
a microscope that uses a needle-like probe to measure differences in voltage caused by electrons that leak, or tunnel, from the surgace of the object being viewed
the theory that states that all living things are made up of cells, that celss 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
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
the region of the cell within the membrane that includes the fluid, the cytoskeleton, and all of the organelles except the nucleus
the cytoplasmic network of protein filaments that plays an essential role in cell movement, shape and division
an organism that consists of a single cell that does not have a nucleus or cell organelles; an example is bacterium
an organism made up of cells that have a nucleus enclosed by a membrane, multiple chromosones, and a miotic cycle; eukaryotes include animals, plants and fungi but not bacteria or cyanobacteria
in a eukaryotic cell, biology, a membrane-bound organelle that contains the cell's DNA and that has a role in processes such as growth, metabolism and reproduction
one of the small bodies that are found in the cytoplasm of a cell and that are specialized to perfrom body functions
a hairlike structure arranged in tightly packed rows that projects from the surface of some cells
a system of membranses 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
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
cell organelle that helps make and package materials to be transported out of the cell
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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