Answered: 40. Which of the following materials…

Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

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For items 40-52 choose the letter of the best answer. No need to write the explanations. 40. Which of the following materials will NOT be allowed to pass into the cell through the plasma membrane? A. cell components B. nutrients C. raw materials D. wastes 41. Osmosis is considered a form of diffusion. Why? A. It depends on a concentration gradient. B. it requires a semipermeable membrane. C. It depends on a water potential gradient. D. It moves from a high to low area of concentration. 42. Which is NOT true about the factors that can affect the rate of diffusion? A. application of pressure increases the rate of diffusion B. higher temperature results in a faster rate of diffusion C. the solubility of the solute does not affect the rate of diffusion D. the higher the density of the solvent, the slower the rate of diffusion 43. When a nomal cell is placed in a hypertonic solution, what will happen? A. water exits the cell B. solutes exit the cell C. water enters the cell D. solutes enter then leave the cell 43. What does active transport require/s? A. carrier proteins B. energy in the form of ATP C. movement against a gradient D. all the preceding choices are required 45. Which of the following is NOT true about facilitated diffusion? A. requires energy B. requires a carrier protein C. requires a concentration gradient D. all the preceding choices are true 46. What does osmosis distinctly requires? A. energy production B. concentration gradient C. semipermeable membrane D. water permeable membrane 46. When human red blood cells are placed in a hypertonic solution, what will happen to the cells? A. crenated B. phagocyte C. plasmolyze D. become turgid 48. Which solution will cause a normal cell to plasmolyze or lose its water? A. hypotonic solution B. isotonic solution C. hypertonic solution D. both A and B 49. Which transport mechanism will allow a sodium and potassium ions to enter the cell against the electro-chemical gradient? A. active transport B. endocytosis C. phagocytosis D. pinocytosis 50. When a cell is placed in a hypotonic solution, what will happen? A. the cell wall breaks B. the vacuole expands C. the cytoplasm shrinks D. the cell membrane shrinks 51. If someone at the end of a restaurant smokes a cigarette, you may breathe in some smoke. Which transport mechanism can explain the movement of smoke? A. active transport B. diffusion C. facilitated diffusion D. osmosis 52. When the concentration of molecules on both sides of the membrane is equal, what is happening to the diffusing molecules? A. going outside of the cell B. going inside of the cell C. continue moving on both directions D. stop moving across the membrane

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