Principles of Biology
Principles of Biology
2nd Edition
ISBN: 9781259875120
Author: Robert Brooker, Eric P. Widmaier Dr., Linda Graham Dr. Ph.D., Peter Stiling Dr. Ph.D.
Publisher: McGraw-Hill Education
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Chapter 5, Problem 7TY
Summary Introduction

Introduction:

When the water moves from a region of high concentration to a region of low concentration through a semipermeable membrane, that process is known as osmosis.The process is important as it helps to absorb and excrete ions and other materials inside or out of the cells.

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If you place a flaccid plant cell with ΨS = -0.4 MPa in pure water, which of the following will occur? A. Water will not enter the cell because the flaccid cell has solutes and low water potential. B. Water enters the cell because the flaccid cell has solutes and low water potential. C. Water enters the cell because the flaccid cell has solutes and high water potential. D. Water will not enter the cell because the flaccid cell has solutes and high water potential.
Rebuild the cell above that is hypertonic to the solution outside.  By hitting the red button, add 20 solutes (green) to the inside of the cell and add 5 water (blue) to the inside of the cell.  Also, add 20 water (blue) to the outside of the cell and 5 solutes (green) to the outside of the cell.  Add blue gated channels to the membrane. Q: What happens to the water molecules in this situation? Q: Which of the above situations is closer to a living membrane system?
Osmosis is the diffusion of water, and can be driven by many different factors, including temperature, pressure, the nature of the location, and solute concentration. Which of these is a requirement for osmosis to occur?     Water must flow from low to high water potential.   Only within plant cells is pressure required.   Temperature must be above 30 C.   There must be a semipermeable membrane.
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