Given what we know about diffusion / the cell membrane, what is able to diffuse and cannot diffuse across the cell membrane? Why? Must use words: hydrophobic, hydrophilic, ions, uncharged molecules, charged molecules. (Give specific examples for each)

Classify each example as requiring either diffusion or bulk flow as a mechanism for molecular transport. Diffusion Bulk Flow

Match the following statement related to membrane transport processes to the appropriate term or terms: passive transport, facilitated transport, active transport. A transporter (or carrier) protein is necessary. (Select all that apply.) passive transport facilitated transport active transport O O

Which of the following types of molecules can never move across the phospholipid bilayer of a cell membrane by simple diffusion? Group of answer choices Steroids Fats Lipids Ions

The surface area to volume ratio affects the ability of the cell to exchange nutrients and waste products with the outside environment. Many factors affect the movement of molecules across the cell membrane, including membrane thickness, temperature, pressure, concentration gradient, molecular mass, distance travelled, solvent properties and surface area of the cell. In general, according to Einstein’s approximation equation (Equation 1), diffusion time is inversely proportional to the to the diffusion coefficient (D), where t is time and x is distance travelled. The diffusion coefficient is unique to each type of molecule and is determined experimentally. Waste products such as carbon dioxide (CO2) pose a unique problem to cells as their accumulation may be lethal. Exchange with the external environment is dependent upon the distance the waste must travel; for a round cell this will be up to half the cell diameter. Using the diffusion coefficient (D) for carbon dioxide (1.97 × 10-5…

I think it works by freezing the bilayer of the membrane and then hitting it sharply with a diamond knife. The sharp hit creates a fracture in the membrane and usually that fracture follows the plane between the two layers of the membrane lipid.

Which of the following best describes diffusion (passive transport)?   Group of answer choices: Net movement of molecules from an area of low concentration to an area of high concentration. Net movement of fluids from the environment into and out of an organism. Net movement of molecules from an area of high concentration to an area of low concentration. Net movement of molecules between cells.