24. Can a lipid soluble protein readily cross the cell membrane? a. Yes b. No 25

Question

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 b. Hydrophobic 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) Yes it can pass the membrane as it is lipid soluble.

25) Hydrophilic because phosphate is hydrophilic so regardless of its place it will always be hydrophilic.

26) Hydrophilic because it is inside the cell and inside the cell is hydrophilic.

27) Hydrophobic because fatty acid itself is hydrophobic.

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