Which of the following statements is correct about diffusion? A) It is very rapi

Question

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 moves 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 lover concentration to one of higher concentration. E) It requires integral proteins in the cell membrane. Water passe 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. Mammalian blood contains the equivalent of 0.15 M NaCl. Seawater contains the equivalent of 0.45 M NaCl. 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) NaCl will passively diffuse into the red blood cells. E) The blood cells will expend ATP for active transport of NaCl into the cytoplasm. When a plant cell, such as one from a peony stem, is submerged in a very hypotonic solution. what is likely to occur? A) The cell will burst B) The cell membrane will lyse. C) Plasmolysis will shrink the interior. D) The cell will become flaccid. E) The cell will become turgid. The movement of potassium into an animal cell requires A) low cellular concentrations of sodium. B) high cellular concentrations of potassium. C) an energy source such as ATP. D) a cotransport protein. E) a potassium channel protein. An organism with a cell wall would most likely be unable to take in materials through A) diffusion. B) osmosis. C) active transport.

Explanation / Answer

1.Ans- c

Diffusion is a process in which molecules move from a region of higher concentration to the region of lower concentration. Since it is a passive transport because it moves the ions or molecules from higher to lower concentration and doesn't require any energy.

11. Ans- e

When water passes through the cell membrane is called osmosis with the help of aquaporins. Aquaporins are an integral membrane protein that selectively carries water molecules in and out of the cell and preventing the passage of other molecules.

12.Ans- a

When red blood cell placed in sea water the cells become shrivel and collapse. As we know that sea water is a hypertonic solution to the blood cell that means more solute particle is dissolved than the blood cell. Therefore, water will move out the cell to maintain the balance through the process of osmosis.

13)Ans- e

A hypotonic solution means there is a less concentration of solutes and more water concentration than the plant cell.Therefore higher concentration of water outside the plant cell. So as a result water moves from outside to the plant cell. Therefore in the plant cell volume increased that causes swell and become turgid.

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