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Chapter 2
Viruses and Cells
21
Science
7th Grade
09/19/2010

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Term
Virus
Definition
a microscopic particle made of either a DNA or an RNA core and covered with a protein coat; it infects host cells in order to reproduce
Term
Host cell
Definition
a living cell in which a virus reproduces.
Term
Vaccine
Definition
a solution made from damaged virus or bacteria particles or from killed or weakened viruses or bacteria; can prevent but not cure many viral and bacterial diseases.
Term
AIDS
Definition
acquired immune deficiency syndrome. A fatal communicable disease caused by HIVS
Term
Compound Light Microscope
Definition
an instrument that uses light and convex lenses to magnify objects
Term
Electron Microscope
Definition
an instrument that bends beams of electrons in a magnetic field.
Term
Cell Theory
Definition
a major theory of life science. The cell is a basic unit of life.
Term
Cell Membrane
Definition
the selectively permable outer boundry of a cell that allows food and oxygen to move into the cell and waits to leave it.
Term
Nucleus
Definition
The structure inside a cell that directs the cell's activities
Term
Chromatin
Definition
hereditary material in a cell's nucleus.
Term
Cytoplasm
Definition
the gel like substance inside the cell membrane that contains structures that carry out life processes.
Term
Organelle
Definition
in eukaryotic cells, the structures within the cytoplasm that breaks down food.
Term
Endoplasmic Reticulum?
Definition
a cell organelle consisting of folded membranes that move materials around the cells.
Term
Ribosome
Definition
a cell organelle on which protein is made.
Term
Golgi Body
Definition
cell organelles consisting of stacks or membrane-covered sacks that package and move proteins to the outside of the shell.
Term
Mitochondria
Definition
cell organelles that break down food molecules and release energy.
Term
Lysome
Definition
a cytoplasmic organelle that contains chemicals and digests wastes and worn out cell parts.
Term
Cholorplast
Definition
plant cell organelles in which light energy is changed into chemical energy in the form of sugar during photosnythesis.
Term
Cell Wall
Definition
in plants, the ridgid structure made of cellulose.
Term
Tissue
Definition
group of similar cells that do the same sort of work.
Term
Organ
Definition
a structure made up of different types of tissues that work together.
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