The plasma membrane is semipermeable. Some substances can freely cross the membrane, and some must be assisted across if they are to enter the cell. The diagram below shows five different forms of cell transport across a cell membrane (Labeled A-E). Use this diagram to answer the following questions.
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### Facilitated Diffusion ** Show more…
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1) Identify all transport mechanisms that utilizes vesicles to transport molecules across plasma membrane. (Attention It can be more than one answer.) Please choose what applies! A) Osmosis B) Exocytosis C) Facilitated Diffusion D) Endocytosis E) Diffusion F) Active Transport 2) Identify all transport mechanisms that move particles against their concentration gradient. (It can be more than one answer) A) Endocytosis B) Diffusion C) Active Transport D) Exocytosis E) Osmosis F) Facilitated Diffusion
John N.
1. What is the difference between osmosis and diffusion? A) they are the same in all ways B) osmosis only occurs in marine (salt water) organisms C) diffusion only occurs in animal cells while osmosis occurs in all cells D) they are the same except osmosis specifically and only involves water 2. What is the role of cholesterol in cell membranes? A) cholesterol has no role in cell structure B) it stabilises the membrane by adding rigidity to its structure C) it gives membrane proteins a way to communicate with each other D) it kills the cell by hardening it 3. How are chloroplasts similar to bacteria? A) they both have their own DNA B) all of these are correct C) they both have a cell wall D) they divide independently of the cell in which they are found
Sri K.
Active transport differs from facilitated diffusion in that: A. Ions are not transported via active transport, only by facilitated diffusion. B. Active transport requires a protein component, whereas facilitated diffusion occurs by simple diffusion through the plasma membrane. C. Active transport involves a conformational change in the transport molecule. D. Active transport involves the transport of molecules up their concentration gradient. Question 2: Facilitated diffusion differs from passive diffusion in that facilitated diffusion is: A. Against the concentration gradient. B. Mediated only by a protein channel. C. Mediated only by a protein carrier. D. Mediated by a protein carrier or channel. Question 3: Mutations in the internalization signal of endocytic receptors prevent their interaction with: A. Adaptor proteins. B. Dynamin. C. Caveolin. D. Clathrin.
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