Cell Membrane and Transport Unit 4 Part 2 AP Biology, Mrs. Jensen

Cell Membrane Structure Phospholipid bilayer Proteins Integral Peripheral Carbohydrates Cholesterol

Phospholipid Bilayer

Proteins in the Cell Membrane Carrier vs. Channel Protein

Simple Diffusion

Facilitated Diffusion

Facilitated Diffusion

Glucose Entering the Cell by Facilitated Diffusion

Regulation of Glucose Uptake by Insulin

Osmosis

Osmosis

When comparing two solutions… Solute “Tonic” Concentration Water Concentration Hypotonic Low “Hypo” High Hypertonic High “Hyper” Low Isotonic Same “Iso” Same

Water always moves from HYPOTONIC (low solute, HIGH WATER) to HYPERTONIC (high solute, LOW WATER)

Freshman Bio – Always describing the solution outside the cell

AP Bio – Could be describing the solution outside OR inside the cell AP Bio – Could be describing the solution outside OR inside the cell. IT’S A COMPARATIVE TERM!!

Another way to compare two solutions… “U-tube” problems Grab a piece of scratch paper to draw these diagrams! How “u-tubes” generally work:

#1

The solutions in the arms of a U-tube are separated at the bottom of the tube by a selectively permeable membrane. The membrane is permeable to sodium chloride but not to glucose. 1. At the beginning of the experiment, which side is hypertonic and which is hypotonic? 2.   If you examine side A after 3 days, you should find… (explain what has happened to each substance) #2

Osmosis in Real Cells

Paramecia and Contractile Vacuoles to Maintain Water Balance https://www.youtube.com/watch?v=pahUt0RCKYc

Active Transport Using Protein Pumps

How ATP Provides Energy

Active Transport Using Protein Pumps: Na+ / K+ Pump

Active Transport Using Protein Pumps Example: H+/Sucrose Symporter

Active Transport: Endocytosis

Endocytosis

Active Transport: Exocytosis