CAMPBELL BIOLOGY IN FOCUS-MOD.MASTERING
3rd Edition
ISBN: 9780135191811
Author: Urry
Publisher: PEARSON
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Chapter 15, Problem 10TYU
FOCUS ON INTERACTIONS
In a short essay (100‒150 words), discuss how the processes shown in Figure 15.2 are examples of feedback mechanisms regulating biological systems in bacterial cells.
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Which of the following is NOT part of the endomembrane system?
O chloroplast
plasma membrane
vesicles
endoplasmic reticulum
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Consider the artificial cell experiment below:
Lactose 2.0 M
Ca+ = 0.4 M
The ion channels in the membrane will allow Ca+ to pass freely,
but nothing else. The starting conditions for the experiment are
shown.
Rewrite the following statement to make it correct:
"The calcium ions will move across the membrane because ion
channels allow active transport."
Lactose = 0.1 M
Ca+ = 3.0 M
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In the absence of tension, MscL channel has an energy gap separating the closed and open states Eo = 50 kT. MscL opening is associated with a 20 nm2 in-plane protein expansion (change in A). Plot its open probability (Po) as a function of membrane tension. What will be the open probabilities of two MscL channels if one situates at the pole of the bacterial cell above, another in the middle?
Chapter 15 Solutions
CAMPBELL BIOLOGY IN FOCUS-MOD.MASTERING
Ch. 15.1 - How does binding of the trp corepressor to its...Ch. 15.1 - Describe the binding of RNA polymerase,...Ch. 15.1 - WHAT IF? A certain mutation in E. coli changes the...Ch. 15.2 - Prob. 1CCCh. 15.2 - Compare the roles of general and specific...Ch. 15.2 - Prob. 3CCCh. 15.3 - WHAT IF? Suppose the mRNA being degraded in Figure...Ch. 15.3 - MAKE CONNECTIONS Inactivation of one of the X...Ch. 15.4 - Prob. 1CCCh. 15.4 - WHAT IF? Study the microarray in Figure 15.17. If...
Ch. 15 - If a particular operon encodes enzymes for making...Ch. 15 - The functioning of enhancers is an example of A. a...Ch. 15 - Which of the following is an example of...Ch. 15 - Prob. 4TYUCh. 15 - Prob. 5TYUCh. 15 - Which of the following would not be true of cDNA...Ch. 15 - Prob. 7TYUCh. 15 - SCIENTIFIC INQUIRY Imagine you want to study one...Ch. 15 - FOCUS ON EVOLUTION DNA sequences can act as tape...Ch. 15 - FOCUS ON INTERACTIONS In a short essay (100150...Ch. 15 - Prob. 11TYU
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- In the lab you will prepare a dye solution to test transmembrane transport into yeast cells. The dye stock solution has a concentration of 5 mM. For your experiment, you want the dye concentration to be at 0.25 mM. You do the dilution with water. Select among the following, which of the following method(s) will give you the correct final concentration of dye? 1) adding 1 ml of stock solution to 19 ml of water. 2) making a 25-fold dilution. 3) adding 100 ml of water to 5 ml of dye stock solution. 4) diluting 3 ml of concentrated dye with water to a final volume of 60 ml. A. All methods are accurate B. only methods 1, 2 and 3 are accurate C. only methods 1, 3 and 4 are accurate D. only methods 1 and 4 are accurate E. only method 3 is accurate F. None of the methods reflect the proper dilution method.(edited) [3:16 PM]arrow_forwardShown below are cells (colored) that were recently placed into a beaker containing a clear solution For each scenario, indicate whether movement of the molecule into the cell will occur using facilitated diffusion or active transport. А. B. 125mM 20mM fructose glucose 85MM 35mM fructose glucose OA= facilitated diffusion; B= facilitated diffusion OA= active transport; B= active transport O A= active transport; B= facilitated diffusion A= facilitated diffusion; B= active transportarrow_forwardOne thousand Ca2+ channels open in the plasma membrane of a cell that is 1000 μm3 in size and has a cytosolic Ca2+ concentration of 100 nM. for how long would the channels need to stay open in order for the cytosolic Ca2+ concentration to rise to 5 μm? There is virtually unlimited Ca2+ available in the outside medium (the extracellular Ca2+ concentration in which most animal cells live is a few millimolar), and each channel passes 106 Ca2+ ions per second.arrow_forward
- Part 2A: Preparation of solutions necessary for the investigation of transmembrane transport in yeast In Part 2A, you will make the solutions necessary for Part 2B in the following lab session. 56 mM glucose (Fisher Chemical Company, Waltham, MA) 20 mM HEPES (Fisher Chemical Company, Waltham, MA) pH 6.8 Store this at 4 degrees until the day of the experiment. 03. Determine the total amount of YGM solution you'll need next week in Part 1B, and add to that a good amount extra to be prepared for repeats. Describe in your lab notebook how much YGM your group will likely need AND your exact plan for making it. Tip: Work through the procedure, find where you need YGM and take note of how many experiments you will be doing!arrow_forwardIn the eukaryotic cell, the members of the endomembrane system work together to synthesize protein products used for excretion out of the cell (e.g. insulin, milk etc.) and for use within the cell (e.g. lysosomes etc.). Explain in detail the correct sequence of steps and processes involved. 200 word minimum.arrow_forwardIn the image below, a cell with inactive protein channels in its cell membrane has been added to a solution that contains 0.5 M glucose and 2.8 M NaCl. The cell contains 1.3 M glucose and 2.0 M NaCl. The cell was placed in a [Select] solution and the cell will The protein channels are then activated. These protein channels ONLY facilitate the transport of large, polar substances until equilibrium of water has been [Select] (nothing else). After the protein channels have been activated, the cell will continue to [Select] reached. 1.3 M Glucose 20 M NaCl 0.5 M Glucose 2.8 M NaClarrow_forward
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