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Transcript
Chapter 7
Cellular Structure and Function
7.1 Cell Discovery and Theory
The Cell Theory
 All organisms are composed of one or
more cells.
 The cell is the basic unit of structure and
organization of organisms.
 All cells come from preexisting cells.
Chapter 7
Cellular Structure and Function
7.1 Cell Discovery and Theory
Light Microscopes
 Utilizes a series of
glass lenses and
visible light to
magnify an image
 Magnifies images
up to 1,000 times
the actual size
Chapter 7
Cellular Structure and Function
7.1 Cell Discovery and Theory
Electron Microscopes
 Utilizes magnets to aim a beam of electrons at
a cell to produce
an image
 Magnifies
images up to
500,000 times
the actual size
9560x
Microscopy Links http://biologygmh.com/
Chapter 7
Cellular Structure and Function
7.1 Cell Discovery and Theory
Prokaryotic Cell
 Simple structure
 Contains a plasma
membrane
 Does not contain
membrane-bound
organelles
11,000x
Chapter 7
Cellular Structure and Function
7.1 Cell Discovery and Theory
Eukaryotic Cell
 More complex
structure
 Contains a plasma
membrane
 Contains membranebound organelles
400x
Chapter 7
Cellular Structure and Function
7.2 The Plasma Membrane
Plasma Membrane
 Thin, flexible boundary between the cell
and its environment
 Allows nutrients into the cell
 Allows waste to leave the cell
Chapter 7
Cellular Structure and Function
7.2 The Plasma Membrane
Selective Permeability
 The plasma membrane controls the movement of
substances into
and out of the cell.
Plasma Membrane
 Controls the amount of a
substance entering the cell
 Controls the amount of a
substance leaving the cell
Chapter 7
Cellular Structure and Function
7.2 The Plasma Membrane
 The plasma membrane is composed of the
phospholipid bilayer.
 A phospholipid molecule is composed of a glycerol
backbone, two fatty acid chains, and a phosphate
group.
Chapter 7
Cellular Structure and Function
7.2 The Plasma Membrane
Fluid Mosaic Model
 The phospholipid
bilayer allows other
molecules to “float”
in the membrane.
Other Components
 Proteins
 Cholesterol
 Carbohydrates
Chapter 7
Cellular Structure and Function
7.2 The Plasma Membrane
Proteins
 Transmit signals inside the cell
 Act as a support structure
 Provide pathways for substances to enter and leave
Chapter 7
Cellular Structure and Function
7.2 The Plasma Membrane
Cholesterol
 Prevents fatty acid tails from sticking together
Chapter 7
Cellular Structure and Function
7.2 The Plasma Membrane
Carbohydrates
 Identify chemical signals