Hphy 322 Final (A+ Guaranteed)

Explain the importance of the cell membrane correct answers selective permeability -conducts ions and nutrients -hydrophilic and hydrophobic parts' -transmembrane proteins allow for molecules to be carried across fine vs. crude touch correct answers fineable to localize and feel where you are being touched crude: feels the sensation Simple vs. facilitated diffusion correct answers Simple: doesn't require a carrier because the ions are not moving against the concentration gradient Facilitated: requires a carrier and interaction with a protein Active Transport correct answers requires the interaction with a protein and ATP What is an example of active transport correct answers moving from a lower concentration to that of a higher one ex. the ATPase pump Co-transport correct answers when a molecule attaches to another molecule that can go through a carrier protein Describe the function of the sodium potassium ATPase pump correct answers Pump acts as a carrier that breaks down ATP into ADP and Pi -the breakdown of ATP causes the release of sodium and potassium ions and determines the size of the cell -maintains the resting membrane potential What are the factors that affect diffusion correct answers concentration differences, membrane electric potential, and pressure differences Using the ATPase pump, which way do the ions flow correct answers Sodium is pushed back outside of the cell and Potassium is pushed back in. This accounts for the large concentrations Equilibrium potential correct answers where the electrical potential= chemical potential resulting in not net movement -another term for nernst potential Banana in the ocean analogy correct answers There are more amounts of potassium in the banana and more sodium outside of the banana in the ocean Nernst Potential correct answers used for a single ion to determine the equilibrium potential What does a negative nernst potential indicate correct answers no net movement between the concentration and voltage