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Chapter 1 Vocab
Chapter 1 vocab
24
Science
7th Grade
07/27/2012

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Term
Unicellular
Definition
Made up of one cell
Term
Multicellular
Definition
Made up of more than one cell, usually MANY cells
Term
Microscope
Definition
An instrument that makes am object appear larger than it is
Term
Cell Theory
Definition
Three concepts:
1) living things are made up of cells
2) cells support life
3) cells come from other cells
Term
Bacteria
Definition
Small single-celled organisms
Term
SEM
Definition
Scanning Electron Microscope
Must coat sample with a heavy metal
3 dimensional image is produced
Term
TEM
Definition
Transmission Electron Microscope
Samples must be cut VERY thin
2 dimensional image is produced
Term
Cell Membrane
Definition
Covers and protects animal cells and plant cells
Term
Cytoplasm
Definition
A jelly like substance which fills the cell where most of the "work" of the cell occurs. Contains organelles.
Term
Prokaryotic Cell
Definition
Genetic material is free in the cytoplasm, small cells, Ex: bacteria
Term
Eukaryotic Cell
Definition
Genetic material is inside the nuclear membrane, large cells, Ex: paramecium
Term
Organelle
Definition
Any part of a cell which is enclosed in a membrane. Ex: mitochondria, golgi
Term
Nucleus
Definition
The organelle which contains the genetic material in a eukaryotic cell
Term
Cell Wall
Definition
Tough, outer covering that lies outside the cell membrane in plant cells.
Term
Chloroplast
Definition
Organelles in plant cells which convert sunlight energy to sugar.
Term
Mitochondria
Definition
Organelles in all eukaryotic cells which make the energy needed by the cell using oxygen. The cells "powerhouse."
Term
Vacuoles
Definition
membrane enclosed organelles which store water, sugars and wastes. Used for moving materials both into and out of the cell.
Term
Lysosomes
Definition
Membrane enclosed organelles which breakdown waste materials and old cell parts in animal cells.
Term
Domain
Definition
A broad category of living things based on similar characteristics. There are three domains.
Term
Specialization
Definition
In a multicellular organism cell types have a specific "job." Ex: skin cell, liver cell, etc.
Term
Tissue
Definition
Groups of cells which all perform a similar function. Ex: Liver cells together form the tissue of the liver.
Term
Organ
Definition
Different tissues working together to perform a specific function.
Term
Organ System
Definition
Different organs working together to form a system with a common function. Ex: Nervous system (brain, spinal cord, nerves,etc.)
Term
Organism
Definition
All of the organ systems come together to function as a whole. The highest level of organization. Ex: human, fox
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