Campbell Biology
12th Edition
ISBN: 9780135188743
Author: Urry
Publisher: PEARSON
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Textbook Question
Chapter 18, Problem 14TYU
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?
A single celled, prokaryote organism has the ability to use the Na+/K+ pump in their cell membrane to move Na+ out of the cell and K+ into the cell. The Na+ /K+ pump is an example of a functional protein because it
a) is a Polypeptide presents specific shapes that interact with (binds with) specific molecules,
b) uses electrical interactions with these molecules to produce change in its shape or motion.
C) interacts with specific molecules based on the fit of the molecule into specific active sites in the protein,
d) As a result of the interaction with specific molecules, it can bind with ATP and use the bond energy in the ATP molecule to move the target molecule(s).
e) all the answers are true.
Chapter 18 Solutions
Campbell Biology
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 - Prob. 3CCCh. 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 - 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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- Configurational antrapy Molten globules Clusters of frustrated contacts Functionally siatinet states B Which is the site of folded proteins O A Barrow_forwardPlease help me with part one question 4 Thank you PDF link https://www.cusd80.com/cms/lib/AZ01001175/Centricity/Domain/8922/eofad.pdfarrow_forwardNeed typed solution only and full explanation too ASAP...arrow_forward
- Write the Structure Activity Relationship ( SAR) of Captopril ? Please write at your own words.arrow_forwardthe game. And the game officially started! The game will work by team. Sakuragi and his team are placed in small submarine shrunk down to microscopic size and injected into a stained living ceili. The teams goai is to find out what is happening in the area because the object is slowly occupying the space where there are many creatures are living. They started their path on the fluid. As they continue their journey, they reached in a transparent layer. In order to make the navigational adjustment, 1. they need to identify this substance. What could be this thing? They scanned the area using an ultra telescope designed by the company that useful for their goal. Upon using the tool they have found out that it contains a wide variety of biological molecules magnification micro 2 There are polar and non - polar region. What are these biomolecules? They tried to get insidearrow_forwardHere is a putative peptide sequence (position number on top of residues): 1 2 3 4 5 6 7 8 9 10 11 12 13 NH2- G C G N V T H N Q C V L S -COOH If expressed in a eukaryotic cell (please mark your answer in the blank space): Position(s) ___ could be N-glycosylated Position(s) ___ could be modified with myristic acid and the bond formed would be a ______________ Position(s) ______and _____ could be modified with palmiti c acid and the bond formed would be a ______________ Positio n(s) ________ could be a segment of a lipid-linked protein with a farnesyl anchor and the bond formed would be a ______________ Position(s) ________ could be a segment of an O-glycosylated protein Position(s) ________ could be modified with a glycosylphosphatidylinositol (GPI) anchor Position(s) ________ could be phosphorylatedarrow_forward
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