a. Yes b. No 24. Can a lipid soluble protein readily cross the cell membrane? a.
ID: 205321 • Letter: A
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a. Yes b. No 24. Can a lipid soluble protein readily cross the cell membrane? a. Yes b. No 25. Are the phosphate heads on the outside of the cell hydrophilic or hydrophobic? a. Hydrophilic 26. Are the phosphate heads on the inside of the cell hydrophobic or hydrophilic? a. Hydrophobic 27. Are the fatty acid tails attached to the phosphate head pointing toward the outside of the cell hydrophilic or hydrophobic? a. Hydrophobic b. Hydrophilic 28. Are the fatty acid tails attached to the phosphate head on the inside of the cell hydrophilic or hydrophobic? a. Hydrophilic b. Hydrophobic c. neither 29. What's the difference b/w cell eating and cell drinking? a. Size b. Weight c. Color 30. When considering mechanisms for holding cells together, most tight junctions are found where? a. Epithelial cells b. Heart c. Lungs 31. When considering mechanisms for holding cells together, most gap junctions are found where? a. Epithelial cells b. Heart c. Lungs 32. Which of these does active transport require? A difference in a gradient b/w molecules ATP a. b.Explanation / Answer
24. Option a is correct. Lipophilic (hydrophobic) materials easily pass through the cell membrane because majority of the part of cell membrane is composed of hydrophobic portion.
25. Option a is correct. Phosphate heads are hydrophilic.
26. Option b is correct. Phosphate heads are always hydrophilic.
27. Option a is correct. Tails are hydrocarbon which are hydrophobic
28. Option b is correct. Fatty acid tails are always hydrophobic.
29. Option a is correct. Cell eating is known as phagocytosis and it involves intake of solid material in large vesicle size. Cell drinking is known as pinocytosis and it involves intake of liquid in small vesicle form.
30. Option c is correct. Tight junctions are mostly found in epithelia of lungs.
31. Option b is correct.
32. Option b is correct. Active transport always requires energy.
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