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. The cell is the basic unit of structure and organization of organisms. All cells come from preexisting cells.

Magnifies images up to 1,000 times the actual size 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

Utilizes magnets to aim a beam of electrons at a cell to produce 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/

Eukaryotic U-kary-otic Prokaryotic Pro-kary-otic eu = (prefix) means TRUE pro = (prefix) means BEFORE kary = means NUCLEUS

So what does the word mean or stand for:  Eukaryotic = __________________________ True Nucleus Prokaryotic = __________________________ Before Nucleus

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

Of the six words listed, pick three that you think best fit together. Organelles  Nucleus Eukaryotic  Prokaryotic Plasma Membrane  Cell  Write them down and explain why you think they belong together. Share them with the person beside you and tell them why you choose them. Explain why your partner choose the words (which ones)

Prokaryotic & Eukaryotic Prokaryotic = cells without a nucleus or other membrane bound organelles. (bacteria or virus) - all need a host Eukaryotic = cells with a nucleus and other organelles that are bound by membranes. (human cells)

7.2 Plasma Membrane Selective Permeability ( pur - me - uh - BIH - luh - tee ) is a property that allows some substances to pass through a membrane while keeping others out. Analogy = a similarity in some respects between things that are otherwise dissimilar. Like a fishing net, it allows water and some small fish through, but keeps the bigger fish from going through.

Have students write their own analogy for a cell's selective permeability.

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 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

The plasma membrane is composed of the phospholipid bilayer. 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

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

Made of a Phospholipid bilayer ( Fhas - foh - LIH - pid ) Carbohydrates = acts as sensors (detects harmful things on outside of cell. Cholesterol = helps fatty acids from sticking together Proteins = (transports) - allow things in and out of cell Talk about Peanut Butter and ______________ sandwich.

Have students make a concept map, using the following terms. Plasma membrane  Non-polar  Phospholipids Bilayer  Cholesterol Polar  Proteins