Biology
12th Edition
ISBN: 9780134813448
Author: Audesirk, Teresa, Gerald, Byers, Bruce E.
Publisher: Pearson,
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Chapter 5, Problem 7RQ
Summary Introduction
To determine:
The protein that allows facilitated diffusion of water and also determines the experiment that demonstrated the function of this protein.
Introduction:
A cell membrane is made of different molecules like phospholipids, proteins, and cholesterol that contribute to the flexible nature of a cell membrane. A cell membrane is selectively permeable in nature which means it allows selective substances to enter the cell. The movement of molecules could be passive like in osmosis and diffusion, active transport or facilitated transport.
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Active transport pumps are used to move sodium ions across the membranes of gill cells in freshwater fish species. Which of the following statements about the pumps is accurate?Explain.
a) There are specific binding sites for sodium ions on the pump
b) They require osmosis to carry the sodium ions into the cell
c) This is an example of passive diffusion and ATP is required
d) Their lipid based structure allows it to embed in the cell membrane
Propose an experiment that would distinguish pore-mediated diffusion (e.g.,by gramicidin) from carrier-mediated diffusion (e.g., by valinomycin).
Briefly describe the experiment carried out to demonstrate that proteins are capable of lateral movement in cell membranes.
Chapter 5 Solutions
Biology
Ch. 5.1 - Vicious Venoms Some of the most devastating...Ch. 5.1 - Prob. 1TCCh. 5.1 - Prob. 2CSCCh. 5.1 - Prob. 1CYLCh. 5.1 - diagram and describe the fluid mosaic model of...Ch. 5.1 - Prob. 3CYLCh. 5.2 - Prob. 1CYLCh. 5.2 - Prob. 2CYLCh. 5.3 - What is likely to have happened If, instead of...Ch. 5.3 - Prob. 1HYEW
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- What could happen to the proteins of cells treated with high amounts of free radicals that would effect the diffusion of those treated cells?arrow_forwardExplain the term Facilitated Transport ?arrow_forwardThe potato blocks used in this experiment are rich in starch molecules. Iodine potassium iodide is a starch indicator that forms a blue-black complex in the presence of starch. What does the width of the black of the potato cube represent in the context of diffusion?arrow_forward
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- Which of the following statements is correct about passive diffusion? Select one: A) It is a process in which molecules move from a region of lower concentration to one of higher concentration (or up a concentration gradient). B) It is a process in which molecules move from a region of higher concentration to a region of lower concentration (or down a concentration gradient). C) It requires an expenditure of energy by the cell. D) It may require a transport protein. E) It involves movement of molecules down a concentration gradient and may require a transport protein.arrow_forwardWhy is it important to determine percent change in mass in regards of an Osmosis Experiment ?arrow_forwardWhat is the relationship between cell size and the efficiency of diffusion in a model cell?arrow_forward
- Using appropriate examples, distinguish between passivetransport and facilitated diffusion.arrow_forwardA red blood cell with an intracellular fluid (ICF) concentration of 280 mmol/L, is placed into an environment were the concentration of the extracellular fluid (ECF) is 305 mmol/L. As a result, water will move across the cell/plasma membrane. a) Name the process by which water moves b) Describe the overall direction of movement of the water. Answer choices: (i) From outside the cell to inside the cell (ii) From inside the cell to outside the cell, or (iii) Equally, into and out of the cell iii Explain your reasoning for your answer to part (c). 1In your answer you must describe the environment on both sides of the membrane, and use 3 of the following 4 terms correctly; hypertonic, hypotonic, lower solute concentration, higher solute concentrationn (2pts -Correct use of biological terminology, and correct spelling is essential. Edit View Insert Format Tools Table 12pt v Paragraph BIUA ...arrow_forwardI am studying pancreatic islet cells and have isolated, cloned, and sequenced a novel protein that you postulate has 4 transmembrane segments. What kind of experiment would allow me to test this hypothesis that there are 4 trans membrane segments?arrow_forward
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