B.requires ATP chemical energy C.an transport froma region of toa region of high D.all of the above are true.Enone of the above 17.Human red blood cells are the ideal materials to study the cell membrane structures because A.Red blood cells can be easily identified by their color B.Red blood cells are available in large number C.Red blood cells have no nucleus and organelles D.Both BandC E.A+B 18.The muscle contraction requires the action of which molecular motor? A.Kinesin B.Myosin.C.Dynein D.Tubulin E.actin 19.Which of the following about apoptosis is not true? A.Isa sort of cellular self-destruction that can take place in normal tissues B.Is accompanied by random DNA degradation C.Is characterized by nuclear fragmentation and cellular breakdown into vesicles. D.Differs from necrosis because necrosis occurs when cell is injured. E.all ofabove 20.Necrosis A.May be mediated by FAS signal pathway. B.Characterized by DNA degraded into about 200bp fragment. C.Is a genetically controlled process D.Occurs when cel is injured E.None of the above 21.In an experiment to test their new drug on humans,two scientists planned to give volunteers one of two drugs Drug A- experimental drug Which of thes ould MOS of the scientists who developed the epcrimctaldnug A.Introduce a third drug into the experiment B.Decrease the number of experimenters from two to one C.Have a third researcher label and distribute the samples D.Replacea portion of the placebos with aspirin. E.All of the abo ove are not true 22.Which of the following is NOT part of the endomembrane system? A.Golgi complex. B.Microtubule C.RER D.Smooth endoplasmic reticulum.E.Lysosome 23.The cell membrane consists mainly of A.water and carbondioxide B.cellulose and pectin C.phospholipids and proteins D.actin and myosin E.none ofabove B.requires ATP chemical energy C.can transport solute from a region of low concentration to a region of high concentration D.all of the above are true. E.none of the above 17.Human red blood cells are the ideal materials to study the cell membrane structures because A. Red blood cells can be easily identified by their color B. Red blood cells are available in large number C. Red blood cells have no nucleus and organelles D. Both B and C E. A+B 18. The muscle contraction requires the action of which molecular motor? A. Kinesin B. Myosin. C. Dynein D. Tubulin E. actin 19. Which of the following about apoptosis is not true? A. Is a sort of cellular self-destruction that can take place in normal tissues. B. Is accompanied by random DNA degradation. C. Is characterized by nuclear fragmentation and cellular breakdown into vesicles. D. Differs from necrosis because necrosis occurs when cell is injured. E. all of above 20. Necrosis A. May be mediated by FAS signal pathway. B. Characterized by DNA degraded into about 200bp fragment. C. Is a genetically controlled process. D. Occurs when cell is injured. E. None of the above 21. In an experiment to test their new drug on humans, two scientists planned to give volunteers one of two drugs: Drug A — experimental drug Drug B — placebo (sugar pill) Which of these would MOST effectively reduce the effect of the bias of the scientists who developed the experimental drug? A. Introduce a third drug into the experiment. B. Decrease the number of experimenters from two to one. C. Have a third researcher label and distribute the samples. D. Replace a portion of the placebos with aspirin. E. All of the above are not true 22. Which of the following is NOT part of the endomembrane system? A.Golgi complex. B.Microtubule C.RER D. Smooth endoplasmic reticulum. E. Lysosome 23. The cell membrane consists mainly of A.water and carbondioxide B. cellulose and pectin C. phospholipids and proteins D. actin and myosin E. none of above