Biology 1201 Exam 2 Questions And Answers!!

Of the following functions, which is most important for the glycoproteins and glycolipids of animal cell membranes? A)facilitated diffusion of molecules down their concentration gradients B)active transport of molecules against their concentration gradients C)maintaining the integrity of fluid mosaic membrane D)maintaining membrane at low temperatures E)a cell's ability to distinguish one type of neighboring cell from another - Answer-E)a cell's ability to distinguish one type of neighboring cell from another What kinds of molecules pass through a cell membrane most easily? - Answer-small and hydrophobic molecules Which of the following statements is correct about diffusion? A)it is very rapid over long distances B)it requires an expenditure of energy by the cell C)it is a passive process in which molecules move from a region of higher concentration to a region of lower concentration D)it is an active process in which molecules move from a region of lower concentration to one of higher concentration E)it requires integral proteins in the cell membrane - Answer-C)it is a passive process in which molecules move from a region of higher concentration to a region of lower concentration A patient has a had a serious accident and lost a lot of blood. In an attempt to replenish body fluids, distilled water, equal to the volume of blood lost, is transferred directly into one of his veins. What will be the most probable result of this transfusion? - Answer-The patient's red blood cells will swell because the blood fluid is hypotonic compared to the cells What is required for the movement of potassium into an animal cell? - Answer-an energy source such as ATP An organism with a cell wall would have the most difficulty doing what process? - AnswerphagocytosisWhich of the following is likely to lead to an increase in the concentration of ATP in a cell? A)an increase in a cell's anabolic activity B)an increase in a cell's catabolic activity C)an increased influx of cofactor molecules D)an increased amino acid concentration E)the cell's increased transport of materials to the environment - Answer-A)an increase in cell's anabolic activity