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Bio Vocab Chapter 4

Biology Vocabulary Chapter 4

TermDefinition
cell a membrane-bound structure that is the basic unit of life.
cell membrane the lipid bilayer that forms the outer boundary of the cell.
cell theory states that (1) all living things are made up of cells, (2) cells are the basic unit of organisms, and that (3) cells come only from existing cells.
cell wall a rigid structure that surrounds to cells of plants, fungi, many protists, and many bacteria.
chloroplast a plastid containing clorophyl; the site of photosynthesis.
chromatin the DNA and proteins in the nucleus of a dividing cell.
chromosome DNA and protein in a coiled, rod shaped form that occurs during cell division.
cilium a short, hairlike organelle that extends from a cell and functions in locamotion or in the movement of substances across the cell surface.
cytoplasm the region of a cell between the cell membrane and the nucleus.
cytoskeleton a network of long protein strands in the cytosol that helps maintain the shape and size of a eukaryotic cell.
eukaryote a cell that contains a nucleus and membrane-bound organelles.
flagellum a hairlike structure made up of microtubules that function in locamotion.
membrane the lipid layer that forms the outside of the cell.
nucleus the organelle that contains most of the DNA and directs most of the cell’s activity.
prokaryote a unicellular organism that lacks a nucleus and membrane-bound organelles.
Created by: vojoker
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