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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- Spring '07