26. Steroid hormones move directly through the cell membrane. Whry? are non pola

Question

26. Steroid hormones move directly through the cell membrane. Whry? are non polar, so they can diffuse through the hydrophobic interior of the plasma membrane. b. These molecules are polar, so they can diffuse through the hydrophobic interior of the plasma membrane These molecules are polar, so they can diffuse through the hydrophililc interior of the plasma membrane. activity of the sodium-potassium pump is critically important in maintaining proper ion concentrations across the ceill membrane. This pump moves ions up their concentration gradient. Given that, what can you conclude about the sodium-potassium pump? a. Sodium and potassium are always at equilibrium with the outside environment. b. c. d. Both of these ions can move freely through the phospholipid bilayer. Both sodium and potassium move down their gradients. The pumping mechanism requires energy 28. On the outside of a normal cell is a 5 percent glucose solution, and on the inside is a 0.2 percent glucose solution. Which of the following statements correctly describes the movement of glucose in this cellular system? a. Sugar molecules move from the outside to the inside through a glucose channel b. The movement of glucose is equal on either side. c. Glucose moves from the inside to the outside through a glucose channel d. No movement occurs with the glucose. Moving slucose requires ATP 29. Which of the following statements about the movement of charged ions through a membrane is correct? a. lons can move directly through the bilayer b. Movement of ions requires a protein passage through the membrane. c. The ions move through the cholesterol of the membrane d. lons are brought into the cell via endocytosis 30. Which of the following pieces of evidence would suggest that a substance entered a cell via active transport as opposed to passive transport? a. The substance moved from a high concentration to a low concentration. b. ATP was required for transport. c. The substance did not move; only water moved d. The substance moved across the membrane via a carrier protein. 31. You have tagged an unknown compound and wish to see how it is absorbed by cells. When you apply it to the outside of a normal cell, it readily flows into the cell. When you remove ATP from the system, it still read ly flows into the cell. When you remove proteins from the membrane, it no longer flows into the cell. What is the likely method of transport for this compound? a. facilitated transport b. exocytosis c. simple diffusion d. active transport 32. Whole organisms can be engulfed and pulled into the cell by the process of a. exocytosis b. pinocytosis c. phagocytosis d. facilitated transport e. active transport 33. Exocytosis moves a materials out of the cell via a vesicle b. large materials into the cell via vesicle formation c a small molecule into the cell through a protein channel

Explanation / Answer

26.a. These molecules are non-polar, so they can diffuse through the hydrophobic interior of the plasma membrane

27.d. The pumping mechanism requires energy

28.a. Sugar molecules moves from outside to the inside through a glucose channel

29.b. Movement of ions require a protein passage through the membrane

30.b. ATP was required or transport

31. a.Facilitated transport

32.c. Phagocytosis

33. a.Moves materials out of the cell via a vesicle

Related Questions

Navigate

• Browse (All)
• Browse 2
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.