The structure pointed by the arrow is?

Choose the best answer 1) If the lipid bilayer in Section B represents the plasma membrane, which part of the protein is the cytoplasmic domain? There is no way to tell which is the cytoplasmic domain with the information given. Section A is the cytoplasmic domain since it contains disulfide bonds. Section C is the cytoplasmic domain since the N-terminus is always found in the cytoplasm. Section C is the cytoplasmic domain since glycosylation cannot occur on the cytoplasmic domain. Section B is the cytoplasmic domain since it is an alpha-helix.  2) Which type of amino acids is most commonly found in Section B? Hydrophilic Hydrophobic There is no way of knowing which type of amino acids is most commonly found in Section B with the given information Charged 3) If the lipid bilayer in Section B represents the ER membrane, which part of the protein is found INSIDE the ER (in the ER lumen)? The entire protein must be inside the lumen of the ER. Section C is inside the ER…

14

6

Item17       Item 17 Which is a passive transport process? Multiple Choice   Phagocytosis   Pinocytosis   Receptor-mediated endocytosis   Osmosis   Ion pump Item18       Item 18 The type of vesicular transport by which large molecules or large amounts of substances are secreted from a cell is _________. Fill in the blank Fill in the blank   Item19       Item 19 Materials tend to move less rapidly when their concentrations are significantly different between two compartments. Group startsTrue or False   Item19       Item20       Item 20   As potassium diffuses down its concentration gradient, it moves out of the cell. However, this movement is resisted by the accumulating negative charge outside the cell.   Group startsTrue or False

11. Fill in the chart below comparing active transport, diffusion, and facilitated diffusion. 6 points total Diffusion Facilitated Diffusion Active Transport Requires energy? (yes or no) Requires a membrane protein? (yes or no)

the structure of the plasma membrane is best described as: two layers of phospholipids stacked on top of each other, with proteins embedded in the phospholipids Oa single layer of proteins and polysachharides mixed together two layers of proteins stacked on top of each other O many sheets of peptidoglycan stacked on top of each other O one layer of triglycerides on top of a layer of proteins

18. What specific proteins make up the cellular cytoskeleton? What protein would you use to look at spindle fibers?

10. What is osmosis? Is it correct to call it the diffusion of water across a membrane permeable only to the solvent, (water), and impermeable to the solutes? Define and understand the terms: isotonic, hypotonic, hypertonic. What are the these conditions on cells with or without cell walls? consequences of

15. -desmosomes -Tight junction -gap junction -tubular connections