Voltage across the membrane depends on an unequal distribution of ions, across t
ID: 162609 • Letter: V
Question
Voltage across the membrane depends on an unequal distribution of ions, across the plasma membrane special membrane proteins can cotransport two solutes by coupling active transport A Freshwater Paramecium is placed into salt water. Which of the following events would occur? an increase in the action of its contractile vacuole swelling of the cell until it becomes turgid swelling of the cell until it lyses shriveling of the cell diffusion of salt ions out of the cell Which of the following would likely move through the lipid bilayer of a plasma membrane most rapidly? CO_2 an amino acid glucose K^+ starch Aquaporins are? beta-barrel proteins in the outer membrane of bacteria ABC proteins symporters water channels When a cell is placed in a hypertonic solution solute exits the cell to equalize the concentration on bathe sides of the membrane water exits the cell toward the area or lower solute concentration water exits the cell toward the area of higher solute concentration solute exits and water enters the cell both a and c are correct Trans epithelial glucose transport uses a symport to transport up a concentration gradient by coupling glucose transport to proton movement coupling glucose transport to Na^+ movement coupling glucose transport to Ca^2+ movement coupling glucose transport to Cl^- movementExplanation / Answer
36. d (Shrivelling of the cell)
The concentration solute in the surrounding salt water is more than that inside the paramecium cell. Therefore due to exosmosis, water will ooze out of the paramecium in order to reach osmotic equilibrium. As a result, the paramecium cell will shrivel.
37. a. CO2
The movement of components through the lipid bilayer is selectively controlled. How rapidly a substance moves through the lipid bilayer depends on its polarity and molecular mass. CO2 bein non-polar and small in size, moves most rapidly.
K+, amino acid and glucose are polar molecules and starch is larger in size.
38. d. Water channels
Aquaporins are integral membrane proteins present in higher eukaryotes and these act as water channels.
39. c. Water exits the cell towards the area of higher solute concentration.
By the process of osmosis, water moves from a region of low solute to high solute concentration.
40. b. coupling glucose transport to Na+ movement.
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