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ch 7 Vocab
Cells
17
Biology
9th Grade
02/14/2007

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Term
cells
Definition
basic units of life
Term
cell theory
Definition
a fundamental concept of biology, was the theory of Theodor Schwann and Rudolf Virchow
Term
nucleus
Definition
is a large membrane enclosed structure that contains the cell's gentic material in the form of DNA
Term
Eukaryotes
Definition
cells that contain nuclei
Term
Prokaryotes
Definition
cells that don't have a nuclei
Term
organelles
Definition
literally little organs
Term
cytoplasm
Definition
is the portion of the cell outside the nucleus
Term
nuclear envelope
Definition
composed of two membranes
Term
chromatin
Definition
the granular material you can see in the nucleus,
Term
chromosomes
Definition
contain the gentic information that is passed from one generation of cells to another
Term
nucleolus
Definition
is where the assembly of rbosomes begins
Term
ribosomes
Definition
are small particals of RNA and protein found throughout the cytoplasm
Term
endoplasmic reticulum
Definition
eukaryotic cells contain this which is an internal membrane system
Term
golgi apparatus
Definition
appears as a stack of closly apposed membranes
Term
Lysosomes
Definition
are small organelles filled with enzymes
Term
vacuoles
Definition
that store materials such as water salts protiens and carbohydrates
Term
mitochondria
Definition
are organelles that convert the chemical energy stored in food into compounds that are move convenient for the cell to use
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