Receptor mediated endocytosis requires the presence of 6. a) carrier proteins that move molecules across the membrane into the cytosol. b) primary active transport pumps. c) specialized proteins on the membrane surface.

Typically, our cells have a high concentration of sodium ions outside and a low concentration of sodium ions inside. Sodium ions continue to move out of the cell by the process of: a) secondary active transport b) pinocytosis c) facilitated diffusion d)simple diffusion e) primary active transport f) osmosis

Some cells in the pancreatic acinus form vesicles containing zymogens. Then the cells secrete the zymogens. Certain proteins called v-SNARES play a role in this process. What best describes the proteins called v-SNARES? a.) v-SNARES are proteins on the cytosolic face of the plasma membrane that help vesicles to fuse with the plasma membrane b.) v-SNARES are a type of glycosphingolipid in the vesicle lipid bilayer that help maintain vesicle integrity c.) v-SNARES are proteins on the surface of vesicles that help the vesicle fuse with the cytosolic face of the plasma membrane d.) v-SNARES are proteins contained inside of vesicles that help stabilize the vesicle contents until the vesicle fuses with the cytosolic face of the plasma membrane

Which of the following best describes the pH of the lysosomal interior? a.) The interior of a lysosome generally has a pH similar to cytoplasm b.) The interior of a lysosome generally has a pH higher than cytoplasm c.) The interior of a lysosome generally has a pH lower than cytoplasm