Biol-1406 Exam 2 (Campbell Biology Ch.5-7) well answered

Biol-1406 Exam 2 (Campbell Biology Ch.5-7) well answeredAmphipathic - correct answer Having hydrophilic and hydrophobic regions; phospholipids are this Overton (Overton's Rule) - correct answer The more lipophilic the molecule, the faster it will diffuse into cell (thus cell membrane has lipid areas) Langmuir - correct answer Phospholipids have polar heads and nonpolar tails ("Langmuir's lemurs have tails") Gorter & Grendel - correct answer Membranes have a phospholipid BILAYER ("the two Gs found two layers") Davson & Danielli - correct answer Sandwich Model of Membrane - layer of protein over phospholipid membrane ("Davson and Danielli Deli") Singer & Nicolson - correct answer Fluid Mosaic Model - proteins are embedded into phospholipid layer ("I'd give a nickel for a song about this mosaic model") What is the fluidity of a membrane controlled by? (2) - correct answer -Fatty Acid (lipid) concentration -Cholesterol (prevents excess fluidity at high temp and excess viscosity at low temp) Scanning Electron Microscope (SEM) - correct answer Used to study topography of a specimen, 3-D image Transmission Electron Microscope (TEM) - correct answer Used to study internal structure of cells, thin layer of stained specimen is viewed