AIDS: Evolution of an Epidemic Bruce Walker, MD and Bisola Ojikutu, MD, MPH are passionate about fighting the global AIDS epidemic. Walker focuses on vaccine development in the lab, while Ojikutu works in the clinic and focuses on epidemiology. Complementing their U.S.-based research, each spends several months a year in Durban in South Africa’s KwaZulu-Natal province—a region at the epicenter of the AIDS epidemic in South Africa and the place with the highest incidence of HIV infection in the world.
gleesonbiology / C3 Student Outcome: C3.1 Describe the structure and function of the cell membrane in terms of the fluid mosaic model. Fluidity of the Plasma Membrane At body temperature, the phospholipid bilayer has consistency of olive oil.In each single part of the bi-layer, the phospholipid tails "wiggle", and entire phospholipid molecules can move sideways at a rate of about 2 µm — the length of a prokaryotic cell — per second.Phospholipid molecules rarely flip-flop from one layer to the other.Fluidity of the phospholipid bilayer allows cell membranes to be flexible.Some proteins are held in place by cytoskeletal filaments; most drift in fluid bilayer. The Membrane Is a Mosaic Source: www.sirinet.net Plant Cell vs Animal Cell Plant and animal cells have several differences and similarities. For example, animal cells do not have a cell wall or chloroplasts but plant cells do. Animal cells are round and irregular in shape while plant cells have fixed, rectangular shapes.
Cell City Analogy Name:___________________________________________ In a far away city called Grant City, the main export and production product is the steel widget. Everyone in the town has something to do with steel widget making and the entire town is designed to build and export widgets. Cell Membrane Function Both eukaryotic cells, including plant cells and animal cells, and prokaryotic cells, e.g. bacteria, are enclosed by a cell membrane. A cell membrane (see the simple diagram on the right) is a thin structure that is also known as the plasma membrane. The main functions of the cell membrane are: to maintain the physical integrity of the cell - that is to mechanically enclose the contents of the cell, and also to control the movement of particles e.g. ions or molecules, into and out of the cell.
Using Bubbles to Explore Membranes Type of Activity: This is a hands-on activity that simulates cell membrane structure and function. This inquiry type lab can be done as a group or cooperative learning experience. Target Audience: Cells Alive worksheet Name:_____________________________________ Cells Alive- Internet Lesson .............www.cellsalive.com Objectives: Understand the relative sizes of objects, including the cell, sketch and identify the function of cell structures; compare eukaryote to prokaryote cells; compare plant and animals cells Part A. "HOW BIG IS A...." (click on the interactive link "howbig" to access this page)
animalcellbiology Extracellular matrix (ECM) is the material found around cells and biochemically partly made by the cell. It is composed of complex mixtures of proteins, proteoglycans, and, in the case of bone tissue, contains mineral deposits as well. Protein; almost all of the proteins found in the ECM are glycoproteins which include any of a group of complex compounds containing sugar units or polysaccharides combined with amino acid units or polypeptides. Some examples are collagen, laminin and fibronectin.
5 Creative Ways to Teach the Cell 1. 3 D Cell – this is a standard project for entry level biology classes, where students use various objects from around the house to design a three dimensional cell. Popular models are made of clay, cardboard, or styrofoam. Pros: Students seem to enjoy the project and you end up with a lot of amazing models. Cons: Can be expensive, difficult to store, or attract bugs if they are made of candy or other perishables, mostly done as individual projects. 2. Cell Membrane Transport • What membranes do • Separate material: ICF / ECF • Allow exchange of material: ICF / ECF • Why transport is important Cell Membrane Structure and Function The Plasma Membrane fluid mosaic model, semi-permeable (selectively permeable), double layer of phospholipids with embedded proteins Jobs of the cell membrane Isolate the cytoplasm from the external environment Regulate the exchange of substances Communicate with other cells Identification Phospholipids (fats) contain a hydrophilic head and a nonpolar hydrophobic tail, which creates a barrier.