Cell membranes are asymmetrical. Which of the following is the roost likely expl

Question

Cell membranes are asymmetrical. Which of the following is the roost likely explanation? A) The cell membrane forms a border between one cell and another in tightly packed tissues such as epithelium B) Cell membranes communicate signals from one organism to another. C) The two sides of a cell membrane face different environments and carry out different functions D) The "innerness" and "outerness" of membrane surfaces are predetermined by genes. E) Proteins can only be associated with the cell membranes on the cytoplasmic side. Which of the following statements correctly describes the normal tonicity conditions for typical plant and animal cells? A) The animal cell is in a hypotonic solution, and the plant cell is in an isotonic solution B) The animal cell is in an isotonic solution, and the plant cell is in a hypertonic solution C) The animal cell is in a hypertonic solution, and the plant cell is in an isotonic solution D) The animal cell is in an isotonic solution, and the plant cell is in a hypotonic solution E) The animal cell to in a hypertonic solution, and the plant cell is in a hypotonic solution. 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. The sodium-potassium pump in animal cells requires cytoplasmic ATP to pump ions across the plasma membrane. When the proteins of the pump are first synthesized in the rough ER, what side of the ER membrane will the ATP binding site be on? A) It will be on the cytoplasmic side of the ER. B) It will be on the side facing the interior of the ER. C) It could be lacing in either direction because proteins are properly reoriented in the Golgi apparatus. D) It doesn't matter, because the pump is not active in the ER. Familial hypercholesterolemia is characterized by which of the following? A) defective LDL receptors on the cell membranes B) poor attachment of the cholesterol to the extracellular matrix of cells C) a poorly formed lipid bilayer that cannot incorporate cholesterol into cell membranes D) inhibition of the cholesterol active transport system in red blood cells E) a general lack of glycolipids in the blood cell membranes In receptor-mediated endocytosis, receptor molecules initially project to the outside of the cell. Where do they end up after endocytosis? A) on the outside of vesicles B) on the inside surface of the cell membrane C) on the inside surface of the vesicle D) on the outer surface of the nucleus E) on the ER

Explanation / Answer

ANSWERS:

45)Cell membranes are asymmetrical. Which of the following is a most likely explanation?

C) The two sides of a cell membrane face different environment and carry out different functions.

46)Which of the following statements correctly describes the normal tonicity conditions for typical plant and animal cells?

D) The animal cell is in an isotonic solution, and the plant cell is in a hypotonic solution.

47)The movement of potassium into an animal cell requires

C) an energy source such as ATP or a proton gradient.

48)The sodium-potassium pump in animal cells requires cytoplasmic ATP to pump ions across the plasma membrane. When the proteins of the pump are first synthesized in the rough ER, what side of the ER membrane will the ATP binding site be on?

A) It will be on the cytoplasmic side of the ER.

49)Familial hypercholesterolemia is characterized by which of the following?

A)defective LDL receptors on the cell membranes

50)In receptor-mediated endocytosis, receptor molecules initially project to the outside of the cell. Where do they end up after endocytosis?

C) on the inside surface of the vesicle

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