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scan0013 - 40 41 42 44 45 Which of the following is true a...

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Unformatted text preview: 40) 41) 42) , 44) 45) Which of the following is true? a) Endocytosis is the reverse of exocytosis / b) Receptor mediated endocytosis is very specific for what it is transporting \/ c) Both edocytosis and exocytosis involve vesicle formation c/ c ‘ Food vacuoles formed from phagocytosis fuse with lysosomes for digestion \/ 6‘ All of the above are correct Which of the following characterizes the sodium—potassium pump? a) 3 sodium ions are pumped out of the cell against their gradient \/ b) 2 potassium ions are pumped into the cell against their gradient x/ c) a carrier protein undergoes a conformational Change'c/ d It is an electrogenic pump in animal cells \/ ‘- 6 all of the above A major function of glycoproteins and glycolipids in the cell membrane is to a5 glue cells together to form tissues allow cell-cell recognition as the cells of an embryo sort themselves into tissues and organs \/ c) attach the cell membrane to the cytoskeleton d) carry out active transport of molecules e) carry out faciiitated transport of molecules Which of the following statements is FALSE? a Transport proteins have specific binding sites for transported molecules b) Aquaporins are channel proteins for specific transport of water/ c) Ions diffuse across membranes down their electrochemical gradient/ d The voltage across the cell membrane is called the membrane potentialx/ e Unlike enzymes, transport proteins cannot be competitively inhibited v/ White blood cell called macrophages engulf bacteria through what process? a) Exocytosis @ Phagocytosis c Pinocytosis d) Receptor mediated endocytosis e) osmosis Who proposed that the membrane is a fluid mosaic with proteins dispersed and individually inserted into the membrane? A) H. Davson and J. Danielli B) J. Dalton _C Avogadro ‘3“. ,J. Singer and G. Nicolson ‘ . Gorter and F. Grendel ...
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