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Cells and Heredity

McDougall 7th Science Unit C Chapter 1 The Cell

WordDefinition
unicellular A term used to describe an organism that is made up of a single cell.
multicellular A term used to describe an organism that is made up of many cells.
microscope An instrument that uses glass lenses to magnify an object.
bacteria A large group of one-celled organisms that sometimes cause disease. Bacteria is a plural word; the singular is bacterium.
cell membrane The outer boundary of the cytoplasm, a layer that controls what enters or leaves the cell; a protective covering enclosing an entire cell.
cytoplasm A thick, gelatin-like material contained within the cell membrane. Most of the work of the cell is carried out in the cytoplasm.
nucleus The structure in a eukaryotic cell that contains the genetic material a cell needs to reproduce and function.
eukaryotic cell A cell in which the genetic material is enclosed within a nucleus, surrounded by its own membrane.
prokaryotic cell A cell that lacks a nucleus and other organelles, with DNA that is not organized into chromosomes.
organelle A structure in a cell that is enclosed by a membrane and that performs a particular function.
cell wall A protective outer covering that lies just outside the cell membrane of plant cells.
chloroplast An organelle in a plant cell that contains chlorophyll, a chemical that uses the energy from sunlight to make sugar.
mitochondria Organelles that release energy by using oxygen to break down sugars.
specialization The specific organization of a cell and its structure that allows it to perform a specific function.
tissue A group of similar cells that are organized to do a specific job.
organ A structure in a plant or animal that is made up of different tissues working together to perform a particular function.
Created by: bunnych
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