This 58-slide teaching PowerPoint presentation covers 2.B (Cell Membrane) in the AP Biology (2015) curriculum. Each slide includes the 'Essential Knowledge' being covered as well as key terms that students should make note of (editable).
Section 2.B includes three sections:
• 2.B.1 - Membrane Structure
• 2.B.2 - Membrane Transport
• 2.B.3 - Endomembranes
The presentations themselves contains minimal information as they are intended to be used with teacher guidance. There are 'Video' slides throughout which link to relevant and informative YouTube content. The slides are formatted to be visually pleasing and to also print well for handouts or revision. Please see the preview file (first 8 slides) for an idea of the aesthetic and level of detail in the presentation. The relevant 'Essential Knowledge' can be found below.
I have had success using these presentations to review topics after students have been exposed to the material at home. I typically have the class read relevant material (book, site, etc.) and then watch the videos the day before introducing a topic. During the class period, I use the slides to structure the discussion around the AP Bio Essential Knowledge objectives. The remaining class time is spent reinforcing the knowledge or working on activities geared toward the 'Learning Objectives'.
**These presentations are based on the AP Biology Course Guide and does not follow any textbook
As always, please let me know if you have any suggestions for improvements. These are always a work in progress!
Dokimi AP Biology PPTs:
Big Idea 1 - Evolution (BUNDLE)
• 1.A - Evolution (all)n
1.A.1 - Natural Selection
1.A.2/3 - Phenotypic Variation & Genetic Drift
1.A.4 - Evidence for Evolution
• 1.B - Phylogeny
• 1.C - Speciation
• 1.D - Origin of Life
Big Idea 2 - Matter
• 2.A - Energy & Matter (all)
2.A.1 - Energy Input (free)
2.A.2 - Energy Capture & Storage
2.A.3 - Environmental Exchanges/Interaction
• 2.B - Cell Membrane
Big Idea 3 - Information
• 3.A - Inheritance (all)
3.A.1 - DNA & RNA
3.A.2 - Cell Division
3.A.3 - Mendelian Patterns
3.A.4 - Non-Mendelian Patterns (free)
Big Idea 4 - Interactions & Complexity
• 4.A - Interactions (all)
4.A.1 - Biomolecules
4.A.2/3/4 - Differentiation, Organelles & Organ System Interactions
4.A.5/6 - Community & Ecosystem Interactions
The Essential Knowledge covered includes:
2.B.1 - Membrane Structure
Cell membranes are selectively permeable due to their structure.
a. Cell membranes separate the internal environment of the cell from the external environment.
b. Selective permeability is a direct consequence of membrane structure, as described by the fluid mosaic model.
- 1. Cell membranes consist of a structural framework of phospholipid molecules, embedded proteins,
cholesterol, glycoproteins and glycolipids.
- 2. Phospholipids give the membrane both hydrophilic and hydrophobic properties. The hydrophilic phosphate
portions of the phospholipids are oriented toward the aqueous external or internal environments, while the
hydrophobic fatty acid portions face each other within the interior of the membrane itself.
- 3. Embedded proteins can be hydrophilic, with charged and polar side groups, or hydrophobic, with
nonpolar side groups.
- 4. Small, uncharged polar molecules and small nonpolar molecules freely pass across the membrane.
Hydrophilic substances such as large polar molecules and ions move across the membrane through
embedded channel and transport proteins. Water moves across membranes and through channel proteins called
c. Cell walls provide a structural boundary, as well as a permeability barrier for some substances to the internal environments. Evidence of student learning is a demonstrated understanding of each of the following:
- 1. Plant cell walls are made of cellulose and are external to the cell membrane.
- 2. Other examples are cells walls of prokaryotes and fungi.
2.B.2 - Membrane Transport
Growth and dynamic homeostasis are maintained by the constant movement of molecules across membranes.
a. Passive transport does not require the input of metabolic energy; the net movement of molecules is from high concentration to low concentration.
- 1. Passive transport plays a primary role in the import of resources and the export of wastes.
- 2. Membrane proteins play a role in facilitated diffusion of charged and polar molecules
through a membrane.
- 3. External environments can be hypotonic, hypertonic or isotonic to internal environments of cells.
b. Active transport requires free energy to move molecules from regions of low concentration to regions of high concentration.
- 1. Active transport is a process where free energy (often provided by ATP) is used by proteins embedded in the
membrane to “move” molecules and/or ions across the membrane and to establish and maintain
- 2. Membrane proteins are necessary for active transport.
c. The processes of endocytosis and exocytosis move large molecules from the external environment to the internal environment and vice versa, respectively.
- 1. In exocytosis, internal vesicles fuse with the plasma membrane to secrete large macromolecules out of the cell.
- 2. In endocytosis, the cell takes in macromolecules and particulate matter by forming new vesicles derived from
the plasma membrane.
2.B.3 - Endomembranes
Eukaryotic cells maintain internal membranes that partition the cell into specialized regions.
a. Internal membranes facilitate cellular processes by minimizing competing interactions and by increasing surface area where reactions can occur.
b. Membranes and membrane-bound organelles in eukaryotic cells localize (compartmentalize) intracellular metabolic processes and specic enzymatic reactions. [See also 4.A.2]
- Endoplasmic reticulum
- Nuclear envelope
c. Archaea and Bacteria generally lack internal membranes and organelles and have a cell wall.This 58-slide teaching PowerPoint presentation covers 2.B (Cell Membrane) in the AP Biology (2015) curriculum. Each slide includes the 'Essential Knowledge' being covered as well as key terms that students should make note of (editable).