26) Water passes quickly through cell membranes because A) the bilayer is hydrop

Question

26) Water passes quickly through cell membranes because A) the bilayer is hydrophilic. B) it moves through hydrophobic channels. C) water movement is tied to ATP hydrolysis. D) it is a small, polar, charged molecule. E) it moves through aquaporins in the membrane. 27) Mammalian blood contains the equivalent of 0.15 M NaCI. Seawater contains the equivalent of 0.45 M NaCI. What will happen if red blood cells are transferred to seawater? A) Water will leave the cells, causing them to shrivel and collapse B) NaCl will be exported from the red blood cells by facilitated diffusion C) The blood cells will take up water, swell, and eventually burst. D) NaCI will passively diffuse into the red blood cells. E) The blood cells will expend ATP for active transport of NaCT into the cytoplasm. 28) Which of the following statements correctly describes the normal tonicity conditions for typical plant and animal cells? A) The animal cell is in a hypotonic solution, and the plant cell is in an isotonic solution. B) The animal cell is in an isotonic solution, and the plant cell is in a hypertonic solution C) The animal cell is in a hypertonic solution, and the plant cell is in an isotonic solution. D) The animal cell is in an isotonic solution, and the plant cell is in a hypotonic solution. E) The animal cell is in a hypertonic solution, and the plant cell is in a hypotonic solution 29) White blood cells engulf bacteria through what process? A) exocytosis B) phagocytosis C) pinocytosis D) osmosis E) receptor-mediated exocytosis

Explanation / Answer

26) Water passes quickly through cell membrane because

E) It moves through aquaporin through the membrane

Water is charged molecule and is difficult to pass from bilipid layer of cell membrane so aquaporin protein channels allow the polar water molecule to pass through them as it has been linked with specific charged chemical groups.

27) A) Water will leave the cell, causing them to shrivel and collapse

This occurs because the salt water outside is more concentrated than RBC that is it has been placed in hypertonic solution so the water flows from RBC to salt water and thus it shrinks.

28) D) The animal cell is in an isotonic solution and the plant cell is an hypotonic solution.

29) WBC engulf bacteria through

B) Phagocytosis

This is the process to defend with foreign particle and causes prevention fro entry of any harmful substances into the body.

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