Dinosaurs are not alive today because they 47. If red blood cells are taken from

Question

Dinosaurs are not alive today because they 47. If red blood cells are taken from the body and placed in a hypertonic solution, what happens to the cells? A) The cells swell and burst because water moves into them B) The cells shrivel up because water leaves them. The cells remain unchanged due to equal solute concentrations inside and outside the cels D) The cells remain unchanged due to equal water concentrations inside and outside the cells. E) They become white blood cells. Imagine that beaker A has a 10% sucrose solution, and beaker B has an 8% sucrose solution. This means that A) beaker A is isotonic relative to beaker B. B) beaker A is hypertonic relative to beaker B. C) beaker A is hypotonic relative to beaker B. 49. Cells use exocytosis to A) move away from danger B) release substances from the cell. C) ingest nutrients. D) pump hydrogen molecules across the membrane. E) create new cells. 50. The hydrophilic regions of a membrane protein are most likely to be found A) only in muscle cell membranes. B) associated with the fatty acid region of the lipids. C) in the interior of the membrane. D) exposed on the surface of the membrane. E) attached to carbohydrates and facing the interior of a cell.

Explanation / Answer

47. B. The cells shrivel up because water leaves them

A hypertonic solution has a higher concentration of solutes that the blood cells, so water moves out to maintain the osmotic balance

48. B. beaker A is hypertonic relative to beaker B

Beaker A has more soluted for the same volume of the solution for beaker B

49. B. release substances from the cell

50. C. in the interior of the membrane

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