Chapter 7 Cellular Structure and Function Section 1: Cell Discovery and Theory Section 2: The Plasma Membrane Section 3: Structures and Organelles Section 4: Cellular Transport

All organisms are composed of one or more cells. Chapter 7 Cellular Structure and Function 7.1 Cell Discovery and Theory The Cell Theory All organisms are composed of one or more cells. cell is the basic unit of structure and organization of organisms. All cells come from preexisting cells.

use a series of glass lenses and light to magnify an image Chapter 7 Cellular Structure and Function 7.1 Cell Discovery and Theory Light Microscopes use a series of glass lenses and light to magnify an image Magnifies images up to 1,000x the actual size

Uses magnets to aim a beam of electrons at a cell to produce an image Chapter 7 Cellular Structure and Function 7.1 Cell Discovery and Theory Electron Microscopes Uses magnets to aim a beam of electrons at a cell to produce an image Magnifies images up to 500,000x the actual size 9560x Microscopy Links http://biologygmh.com/

Contains a plasma membrane 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

More complex structure Chapter 7 Cellular Structure and Function 7.1 Cell Discovery and Theory Eukaryotic Cell More complex structure Contains a plasma membrane Contains membrane-bound organelles 400x

Thin, flexible boundary between the cell and its environment 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

Selective Permeability Chapter 7 Cellular Structure and Function 7.2 The Plasma Membrane Selective Permeability Plasma membrane controls movement of substances into and out of the cell. Also controls the amount of a substance entering and leaving the cell

Plasma membrane is made of the phospholipid bilayer. Chapter 7 Cellular Structure and Function 7.2 The Plasma Membrane Plasma membrane is made 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 Phospholipid bilayer allows other molecules to “float” in the membrane. Other Components Proteins Cholesterol Carbohydrates

Transmit signals inside the cell Act as a support structure 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

Prevents fatty acid tails from sticking together Chapter 7 Cellular Structure and Function 7.2 The Plasma Membrane Cholesterol Prevents fatty acid tails from sticking together

Identify chemical signals Chapter 7 Cellular Structure and Function 7.2 The Plasma Membrane Carbohydrates Identify chemical signals

Chapter 7 Cellular Structure and Function