In this lesson our instructor talks about cell membrane and transport. First she talks about cell membrane structure and cell membrane proteins. Second, she talks about transport across cell membranes, methods of passive transport, and osmosis. Then she discusses active transport, endocytosis, exocytosis, and receptor mediated endocytosis. Four complete example videos round up this lesson.
fluid mosaic model describes the cell membrane as a phospholipid
bilayer embedded with proteins.
are amphipathic; they have hydrophobic fatty acid tails and
hydrophilic heads composed of a phosphate group and its attachments.
cell membrane is selectively permeable. It is most permeable to
small, nonpolar molecules and less permeable or impermeable to
larger, nonpolar molecules and ions.
transport does not require energy. Both simple diffusion and
facilitated diffusion are methods of passive transport.
is the diffusion of water down its concentration gradient.
transport requires energy in order to move a substance against its
concentration gradient. Cotransport uses the energy of one substance
moving down its concentration gradient to move a second substance
against its concentration gradient.
substances can enter the cell via endocytosis, in which the cell
engulfs materials by pinching off a portion of the cell membrane to
form a vesicle. Molecules may leave the cell via exocytosis.
Cell Membranes and Transport
Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.
The book and CD package include two full length practice exams that are presented with all questions answered and explained. The author also presents detailed reviews of all test topics and includes multiple-choice and free-response questions with answers at the end of each topic's chapter.
This book includes a review of the AP Biology exam format and scoring, proven strategies for answering multiple-choice questions, and hints for tackling the essay questions. The practice tests include answers and explanations and there is also proven test-taking strategies for both the multiple choice and essay parts.