18. Hydrophilic molecules such as carbohydrates and amino acids can enter the ce
ID: 275480 • Letter: 1
Question
18. Hydrophilic molecules such as carbohydrates and amino acids can enter the cell by a. b. c. d. e. using protein channels and carriers endocytosis exocytosis a and b are correct a and c are correct GIVEN THE FOLLOWING INFORMATION, ANSWERS QUESTIONS 19-21 The phospholipid of the cell membrane is not permeable to ions. There is more Ca2+ and Na+ outside the cell while there is more K+ inside the cell. 19. If you open up a channel to Ca2+, a) Ca2+ will enter the cell and the charge in the cell will decrease b) Ca2+ will exit the cell and the charge in the cell will decrease c) Ca2+ will enter the cell and the charge in the cell will increase If you open up a channel to K+. a) K+ will enter the cell and the charge in the cell will decrease b) K+ will exit the cell and the charge in the cell will decrease c) K+ will enter the cell and the charge in the cell will increase 20. If you open a channel to Na+, a) Nat will enter the cell and the charge in the cell will decrease b) Na+ will exit the cell and the charge in the cell will decrease c) Nat will enter the cell and the charge in the cell will increase 21. 22. Which observation would suggest that active transportd, rather than passive diffusion, is responsible for a particular substance from the outside of a cell into a cell? a. a higher concentration of the substance outside the cell than inside the cell. b. a higher concentration of the substance inside the cell than outside the cell. c. a positive correlation between ATP breakdown and the amount of substance taken in. d. b and c are both correct. 23.If a cell is placed in a hypertonic solution into the cell and the cell with swell b.water will move out of the cell and the cell will shrink
Explanation / Answer
Answer 18. Option d
Channels and carrier proteins are embedded in the Lipid bilayer and help in transport of carbohydrates and amino acids. Pathogens that contain amino acids as toxin protein are phagocysed by endocytosis in the macrophages.
Answer 19. Option c
As channel opens, Ca2+ will move from outside to inside and increase the internal charge.
Answer 20. Option b
Because K+ is more inside thus opening of channel will cause K+to move out of the cell and charge will decrease in this case.
Answer 21. Option c
Because Na+ are more outside the cell thus, as Channel opens they move into the cell and increase the net charge.
Answer 22. Option d
Active transport takes place against the concentration gradient means from lower to higher concentration and it requires energy, however, passive transport is just opposite of the active transport.
Answer 23. Option b
Exosmosis occurs in cell because it has high solvent and low solute concentration and solution has low solvent and high solute concentration, movement always occurs from high solvent to low solvent concentration, thus cell will loose water and shrink.
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