Which of the following is the driving force for facilitated diffusion?   a. GTP-GDP exchange   b. Phosphorylation   c. ADP Hydrolysis   d. concentration gradient   e. ATP Hydrolysis

One of the following is TRUE? A. The transport of Na+ across cell membranes depends solely on concentration gradient B. The transport of sucrose across cell membranes depends solely on concentration gradient C. The transport of K+ across cell membranes depends solely on concentration gradient D. The transport of Ca2+ across cell membranes depends solely on concentration gradient E. A & C

When a human white blood cell “consumes” a red blood cell (erythrocyte), this process is called:   B. receptor-mediated endocytosis C. pinocytosis D. “cell-drinking” E. exocytosis F.phagocytosis

What type of energy helps drive the passive processes of diffusion, osmosis, and facilitated diffusion? (Pick ALL correct statements involved with this.) In other words what are all the TRUE statements regarding these processes? Select one or more: a.random motion which increases when temperature increases b.ATP energy c.random motion which increases when molecules have large molecular weight d.random motion which increases when molecules concentration decreases e.random motion which increases when molecules concentration increases f.random motion which decreases when temperature decreases g.random motion which increases when molecules have low molecular weight

Liver cells in culture were kept at 0°C and treated with trypsin to digest the receptors on the cell surface. The temperature was then raised to 37°C and radioactive LDL was added to the culture media. Several hours later, the labeled LDL was found to be inside the cells. This specific process of LDL uptake is A. active transport B. facilitated diffusion C. phagocytosis D. pinocytosis E. receptor-mediated endocytosis

The proteins : oxidase ,kinase,lipase, isomerase are all known to function as  a. channels b. transporters c.receptors d. enzymes e. none of the above

Which of the following is incorrect about membrane transport systems? a.   Glucose transport in red blood cells is a uniport system   b.   The Na+/K+ ATPase is an antiport system   c.   The H+/K+ ATPase is an active transport system   d.   The chloride-bicarbonate exchanger in erythrocytes is a uniport system

Na+ moves from high to low concentration, across the plasma membrane, through a protein channel that is permenantly open. Which statement is true about this process? a. It does not require ATP b. It is a form of active transport  c. Movement is against the concentration gradient of Na+ d. The channel probably allows many different molecules and ions to cross

Choose the processes from the list below which require active transport  A. Water moving through the membrane  B. Sodium moving out of a cell C. Potassium moving into a cell  D. Endocytosis  E. Oxygen moving from inhaled air into blood stream.