39) Which of the following statements deseribes a characteristic feature of a ca

Question

39) Which of the following statements deseribes a characteristic feature of a carrier protein in a plasma membrane? A) It exhibits specificity for a particular type of molecule. B) It requires the expenditure of cellular energy to function. C) It works against diffusion. D) It has no hydrophobie regions. 40) A research team is working on the design of a new drug for the treatment of lung cancer. To be most effective, this drug must specifically enter the cytoplasm of lung cells while not entering the cells of other tissues. Which of the following characteristics would likely enhance the specificity of this drug? A) the relative hydrophobicity of the drug molecule B) phospholipid composition of lung cell plasma membranes C) specificity of the drug molecule for binding to the extracellular matrix of lung cells D) similarity of the drug molecule to other molecules normally transported lung cells 41) Five dialysis bags, constructed of a type of membrane that is permeable to water and impermeable separate intervals, the bags were massed (weighed), and the percent change in mass of each bag was graphed. to sucrose, were filled with various concentrations of sucrose and then placed in te beakers containing an initial concentration of 0.6 M sucrose solution. At 10-minute ?60 Which line or lines in the graph represent(s) bags that contain a solution that is hypertonic at 50 minutes? A) A and EB D) D and E 42) What will happen to a red blood cell(RBC), which has an internal ion content of about 0.9%, if it is placed into a beaker of pure water? A The cel would shrink because the water in the beaker is hypotonic relative to the cytoplasm of the RBC. B) The cell would shrink because the water in the beaker is hypertonic relative to the cytoplasm of the RBC. C) The cell would swell because the water in the beaker is hypotonic relative to the cytoplasm of the RBC The cell will remain the same size because the solution outside the cell is isotonic.

Explanation / Answer

39) which of the following statment describe characteristic features of carrier protein in plasma membrane

ANS- it require the expenditure of cellular energy to function

40) ans- specificity of the drug molecule for binding to the extracellular matrix of lung cell

41) ANS- A &B hypertonic means concentration of solute is high.

42) ANS- c-The cell would swell because the water in the beaker is hypotonic relative to the cytoplasm of the RBC.t

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