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Biology - The cell
The Cell and its parts
8
Biology
Not Applicable
10/30/2005

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Term
Cell Theory
Definition
1. All living things are composed of cells.
2. The cell is the basic functional unit of life.
3. Cells arise from pre-existing cells.
4. Cells carry genetic information in the form of DNA, which is passed from parent to daughter cell.
Term
Autoradiography
Definition
The use of radioactive molecules to race and identify cell structures and biochemical activity.
Term
Centrifugation
Definition
a means of stratifying mixtures by density by spinning it at high speeds.
Term
Prokaryotes
Definition
A group including bacteria and cyanobacteria. Simple, unicellular structure with an outer membrane, but no membrane bound organelles. The DNA is in the nucleoid region, as opposed to a nucleus. It is circular and other smaller rings of DNA, plasmids, may be be there. Plasmids replicate independently.
Term
Prokaryotes
Definition
A group including bacteria and cyanobacteria. Simple, unicellular structure with an outer membrane, but no membrane bound organelles. The DNA is in the nucleoid region, as opposed to a nucleus. It is circular and other smaller rings of DNA, plasmids, may be be there. Plasmids replicate independently.

Ribosomes consist of subunits 30S and 50S.
Term
Eukaryotic cells
Definition
All multicellular and nonbacterial unicellular organisms are eukaryotic. Has membrane bound organelles, DNA organized into chromosomes, and bound in a Nucleus.
Term
The Cell Membrane
Definition
Composed of a double phospho lipid bi-lair, the cell membran does many things: It provides protection. It controls the flow of material in and out of the cell. It helps to establish the electrochemical gradiant necessary for homeostatic processes.
Term
The Nucleus
Definition
Controls the activity of the cell. It's surrounded by a double membrane called the nuclear membrane/envelope. This membrane has holes called nuclear pores.
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