B150MalF98T12 - premed411.com B150MalF9812 BIL 150 Test#2...

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BIL 150 Test #2 Fall 1998 02 November 1998 FORM 0 Mallery - Sections PT MULTIPLE CHOICE Instructions: Pick the BEST answer choice form among those given. 1) A protein of a biological membrane that is easily removable without losing its biological activity or structural integrity is best referred to as a(an) ? a) extra-cellular protein b) intrinsic protein c) an enzyme d) peripheral protein e) choose this answer if none of the above is correct 2) From among those given, which of the following would most likely move rapidly through the lipid bilayer of a membrane? 3) According to the fluid-mosaic model of membrane structure, phospholipids in a membrane frequently flip-flop from one side of the membrane to the other ? a) true b) false 4) The interior portion of a biological membrane ? 5) From the choices given which is most likely to be involved directly in active transport ? 6) The net movement of uncharged molecules from an area of low concentration to an area of higher concentration is? a) diffusion b) active transport c) osmosis d) exocytosis e) none of these is correct 7) The electrical voltage across a cell membrane is called its ? 8) The Na-Pump (sodium-potassium ATPase) is referred to as an electrogenic pump because it ? a) pumps equal amounts of Na and K across membranes by diffusion b) pumps hydrogen ions into a cells c) ionizes sodium d) results in a net movement of + charge to one side of a membrane d) choose this answer if none of these is correct 9) An organism with a cell wall of cellulose would probably have the greatest difficulty doing which of the following membrane processes ? 10) Carrier molecules, as protein/enzymes, in plasma membranes are directly required for ?
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