Biology: Life on Earth
10th Edition
ISBN: 9780321729712
Author: Gerald Audesirk, Teresa Audesirk, Bruce E. Byers
Publisher: Benjamin Cummings
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Textbook Question
Chapter 5, Problem 7RQ
Name the protein that allows facilitated diffusion of water. What experiment demonstrated the function of this protein?
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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).
What could happen to the proteins of cells treated with high amounts of free radicals that would effect the diffusion of those treated cells?
Chapter 5 Solutions
Biology: Life on Earth
Ch. 5 -
1. Membranes consist of a bilayer of ________....Ch. 5 - A membrane that is permeable to some substances...Ch. 5 - Facilitated diffusion involves either _____...Ch. 5 - Prob. 4FTBCh. 5 -
5. After each molecule, place the two-word term...Ch. 5 - Prob. 6FTBCh. 5 - Describe and diagram the structure of a plasma...Ch. 5 - Prob. 2RQCh. 5 - What are the five categories of proteins commonly...Ch. 5 - Prob. 4RQ
Ch. 5 -
5. Define hypotonic, hypertonic, and isotonic....Ch. 5 -
6. Describe the following types of transport...Ch. 5 - Name the protein that allows facilitated diffusion...Ch. 5 - Imagine a container of glucose solution, divided...Ch. 5 - Prob. 9RQCh. 5 -
1. Different cells have different plasma...Ch. 5 - Predict and sketch the configuration of...Ch. 5 - The fluid portion of blood, in which red blood...Ch. 5 - Some cells in the nervous system wrap themselves...
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- Briefly describe the experiment carried out to demonstrate that proteins are capable of lateral movement in cell membranes.arrow_forwardExplain the term Facilitated Transport ?arrow_forwardAmong the statements a, b and c, which is/are false? a) Endocytosis is the formation of vacuoles by the plasma membrane for the purpose oftransport inside the cell a small content of extracellular fluid. b) Exocytosis is the formation of vacuoles by the plasma membrane for the purpose oftransport a small amount of intracellular fluid out of the cell. c) Pinocytosis is a form of endocytosis. d) All of these statements are false. e) None of these statements is false.arrow_forward
- The 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_forwardWhich 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_forwardThe following questions refer to membrane protein isolation A) What is the difficulty when working with membrane proteins and extracting them from the membrane? B) Why do you need stabilization of membrane proteins? What reagents are used for stabilization? C) What methods are used to determine if your extracted membrane protein (GPCR) is functional? D) What methods are used for the enrichment of surface proteins? E) What 2 methods are used to analyze and identify surface proteins after extraction?arrow_forward
- Both active and passive transports can be subdivided further. Distinguish between the different pairs of terms below: a) simple diffusion vs. facilitated difussion b) Facilitated diffusion vs. active transport c) channel protein vs. carrier protein d) simple diffusion vs. osmosis e) Uniporter vs. symporter vs. antiporterarrow_forwardWhat is the relationship between cell size and the efficiency of diffusion in a model cell?arrow_forwardWhy is it important to determine percent change in mass in regards of an Osmosis Experiment ?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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