Cambell Biology 11e Vol1 For Utah Valley University Ch 1-25
11th Edition
ISBN: 9781323691519
Author: Urry
Publisher: PEARSON
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Chapter 18, Problem 15TYU
WRITE ABOUT A THEME: INTERACTIONS In a Short essay (100-150 words), discuss how the proccsscs shown in Figure 18.2 are examples of feedback mechanisms regulating biological systems in bacterial cells.
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(c)
The tube and cylinder diagram to the right illus-
trates schematically the potassium channel protein from a
bacterium. This channel protein consists of four identical
polypeptide chains each comprised of 119 residues. The
cyan ribbon illustrates only two of the polypeptide chains.
The relative positions of 4 α-helices, one from each poly-
peptide chain, are shown as cylinders. The red sphere in the
central part of the diagram shows the position of a potas-
sium ion identified by X-ray structure analysis. A cesium ion
(green sphere) was also found to be stabilized in the same
position when cesium chloride was introduced into the crys-
tals.
The cylinders each represent an α-helix running from Tyr62
to Thr74. Considering the position of the potassium ion, in-
dicate on one of the cylinders at which end of the cylinder
residue Tyr62 is found and at which end residue Thr74 is
found. Explain the basis of your answer?
Ala23
Thr119
(d)
The N- and C-terminal residues of one of the…
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 (DA). Using Excel plot its open probability (Po) as a function of membrane tension and paste the graph below. 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?
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 18 Solutions
Cambell Biology 11e Vol1 For Utah Valley University Ch 1-25
Ch. 18.1 - How does binding of the trp corepressor to the trp...Ch. 18.1 - Describe the binding of RNA Polymerase,...Ch. 18.1 - WHAT IF? A certain mutation in E. coli changes...Ch. 18.2 - In general, what are the effects of histone...Ch. 18.2 - MAKE CONNECTIONS Speculate about whether the same...Ch. 18.2 - Compare the roles of general and specific...Ch. 18.2 - Once mRNA encoding a particular protein reaches...Ch. 18.2 - WHAT IF? Suppose you compared the nucleotide...Ch. 18.3 - Compare miRNAs and siRNAs, including their...Ch. 18.3 - WH AT IF? Suppose the mRNA being degraded in...
Ch. 18.3 - MAKE CONNECTIONS Inactivation of one of the X...Ch. 18.4 - MAKE CONNECTIONS As you learned in Chapter 12,...Ch. 18.4 - MAKE CONNECTIONS Explain how the signaling...Ch. 18.4 - How do fruit fly maternal effect genes determine...Ch. 18.4 - Prob. 4CCCh. 18.5 - Prob. 1CCCh. 18.5 - Under what circumstances is cancer considered to...Ch. 18.5 - MAKE CONNECTIONS The p53 protein can activate...Ch. 18 - Compare and contrast the roles of a corepressor...Ch. 18 - Describe what must happen in a cell for a gene...Ch. 18 - Why are miRNAs called noncoding RNAs? Explsin how...Ch. 18 - Describe the two main processes that cause...Ch. 18 - Compare the usual functions of proteins encoded by...Ch. 18 - If a particular operon encodes enzymes for making...Ch. 18 - Muscle cells differ from nerve cells mainly...Ch. 18 - The functioning of enhancers is an example of (A)...Ch. 18 - Cell differentiation always involves (A)...Ch. 18 - Which of the following is an example of...Ch. 18 - What would occur if the repressor of an inducible...Ch. 18 - Absence of bicoid in mRNA from a Drosophila egg...Ch. 18 - Which of the following statements about the DNA in...Ch. 18 - Within a cell, the amount of protein made using a...Ch. 18 - Prob. 10TYUCh. 18 - draw it The diagram below shows five genes,...Ch. 18 - Prob. 12TYUCh. 18 - Prob. 13TYUCh. 18 - SCIENCE. TECHNOLOGY, AND SOCIETY Trace amounts of...Ch. 18 - WRITE ABOUT A THEME: INTERACTIONS In a Short essay...Ch. 18 - SYNTHESIZE YOUR KNOWLEDGE The flashlight fish has...
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