In order to appreciate how organisms function on the cellular level it is essential to understand how molecules move across membranes. This lecture will provide the fundamentals of passive and active transport systems.
Read Chapter 5 in the textbook: Biology:Concepts & Principles.
Refer to page 118 - Chapter Summary in Exploring the Natural World - for the terms and key points you need to know. The Key Points are your guide to success in the course because they focus your attention on those topics upon which you need to concentrate your study to be optimally prepared for the upcoming examination.
Also study the references to the textbook which are indicated in the Survey of Biology Lecture Notes.
Have crossword for Chapter 8 ready to hand in upon arrival.
Nothing needs to be completed in the procedure before the start of lab.
Quiz everyone in the group on the flashcards labeled "Transport." Try to complete this before the lecture called "Movement of Molecules in Living Systems."
Review each of the following topics:
5A - Chemical Reactions & ATP
Take particular note of the 3rd animation in this series which clearly illustrates the phospholipid bilayer in the membrane of cells.
5B - How Enzymes Work
This is a good review of what was discussed in lecture regarding the action of enzymes in living systems.
5C - Membrane Structure
5D - Signal Transduction
This interesting animation illustrates how cells communicate with one another
5E - Diffusion
This animations will help you to understand concentration gradients.
5F - Osmosis
This animation will show you the differences between hypertonic, hypotonic, and isotonic solutions.
5G - Facilitated Diffusion
While this is a passive transport system not requiring energy input, it does use a protein carrier.
5H - Active Transport
This activity requires energy input - endergonic.
5I - Exocytosis and Endocytosis
This animation clearly shows how large substances or large quantities of substances can move into cells (endocytosis) or out of cells (exocytosis).