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Chapter 2 Key Terms
The keyterms from chapter 2.
15
Science
7th Grade
09/17/2010

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Term
Cell Membrane
Definition
A cell's outer covering.
Term
Cell Theory
Definition
States that all organisms are made up of one or more cells, the cell is the basic unit of life, and all cells come from other cells.
Term
Cell Wall
Definition
A tough rigis outer covering that protect plant, algae, and fungi cells a nd give it shape.
Term
Chloroplast
Definition
Green organelles where photosynthesis occurs in a plant.
Term
Cytoplasm
Definition
Where the heredity material that controls the life of every cell is located.
Term
Endoplasmic Reticulum
Definition
A series of folded membranes in which materials can be processed and moved around inside the cell.
Term
Golgi Body
Definition
Stacked flattened membranes that sort proteins and other cellular substances and package them into membrane-bound structures called vesicles.
Term
Host Cell
Definition
Living cell in which a virus can actively multiply or in which a virus can hide until activated by environmental stimuli.
Term
Mitochondrion
Definition
Where the energy in food is stored.
Term
Nucleus
Definition
Controls all cell activities and is seperated from the cytoplasm by a membrane.
Term
Organ
Definition
A structure made up of two or more different types of tissues that work together.
Term
Organelle
Definition
Some produce energy and others manufacture substances needed by the cell or other cells.
Term
Ribosome
Definition
Where a cell makes its nesscaray proteins.
Term
Tissue
Definition
A group of cells that work together to do one job.
Term
Virus
Definition
A strand of hereditary material surrounded by a protein coating.
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