Brock Biology of Microorganisms (15th Edition)
15th Edition
ISBN: 9780134261928
Author: Michael T. Madigan, Kelly S. Bender, Daniel H. Buckley, W. Matthew Sattley, David A. Stahl
Publisher: PEARSON
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Chapter 17.9, Problem 1MQ
Summary Introduction
Thermophiles are the organisms mostly microbes which survive in extreme heat environment at the temperature of 41oC and above upto 122oC. Acidophiles are the organisms which lives in extreme acidic environments even at the below pH level of 1. Organisms which live in both hyper temperature and acidic environment is said to be thermoacidophilic organisms ( example:Crenoarcaeota).
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While the sarcoplasmic reticulum of muscle was first described by nineteenth-century microscopists, its true significance was not ap-preciated until its intricate structure was revealed much later by the electron microscope. What could you tell a nineteenth-century microscopist to enlighten him or her about the structure of the sarcoplasmic reticulum and its role in the coupling of excitation and contraction?
Can you match the sacromere anatomy with the proper answer from the list below the table graph?
Sarcomere Anatomy
Description/Reaction
Thin Filaments
?
Thick Filaments
?
A Band
?
I Band
?
M Line
?
H Zone
?
Z Disc
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A) G-Actin, F-Actin, Troponin, Tropomyosin
B) Myosin
C) Bisected by the M Line, this area shows only the thick filaments without any thin filamentous overlap
D) The point of origin for myosin filaments found in the center of the sarcomere
E) An area in the center of the sarcomere marked by the entire length of the thick filaments
F) A space between sarcomeres with the z-disc in the center; this region shows Actin's anchorage points and extension without myosin overlap
G) Anchoring point for the thin filaments
What do Intermediate filaments provide?
Chapter 17 Solutions
Brock Biology of Microorganisms (15th Edition)
Ch. 17.1 - Since cells of Halobacterium require high levels...Ch. 17.1 - What benefit does bacteriorhodopsin confer on...Ch. 17.1 - Contrast the roles of bacteriorhodopsin,...Ch. 17.2 - Prob. 1MQCh. 17.2 - Prob. 2MQCh. 17.2 - Prob. 1CRCh. 17.3 - Prob. 1MQCh. 17.3 - Prob. 2MQCh. 17.3 - What two major physiological features unify...Ch. 17.4 - Prob. 1MQ
Ch. 17.4 - Prob. 2MQCh. 17.4 - Prob. 1CRCh. 17.5 - Prob. 1MQCh. 17.5 - Prob. 2MQCh. 17.5 - Prob. 1CRCh. 17.6 - Prob. 1MQCh. 17.6 - Prob. 2MQCh. 17.6 - Prob. 1CRCh. 17.7 - Prob. 1MQCh. 17.7 - Prob. 1CRCh. 17.8 - What form of energy metabolism is widespread among...Ch. 17.8 - Prob. 2MQCh. 17.8 - Prob. 1CRCh. 17.9 - Prob. 1MQCh. 17.9 - Prob. 2MQCh. 17.9 - Prob. 1CRCh. 17.10 - What can we conclude about the...Ch. 17.10 - Prob. 2MQCh. 17.10 - Prob. 1CRCh. 17.11 - Prob. 1MQCh. 17.11 - Why would it be impossible for organisms to grow...Ch. 17.11 - What organism is the current record holder for the...Ch. 17.12 - How do hyperthermophiles keep proteins and DNA...Ch. 17.12 - How are the lipids and ribosomes of...Ch. 17.12 - What is reverse DNA gyrase and why is it important...Ch. 17.13 - What phylogenetic and physiological evidence...Ch. 17.13 - Prob. 2MQCh. 17.13 - Which chemolithotrophic lifestyle seems best...Ch. 17.13 - Why might H2 metabolism have evolved as a...Ch. 17 - Using the phylogenetic tree in Figure 17.1 as a...Ch. 17 - Prob. 2AQ
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- How is filament polarity detectable?arrow_forwardYou’re having a discussion with a colleague who insists that intermediate filaments, IFs, provide very little mechanical strength to cells. How can you rebut this and provide quantitative, experimental evidence to measure the strength of an intermediate filament using microscopy?arrow_forwardHow are the amounts of ATP-actin, ADP-Pi-actin, and ADP-actin in a filament determined?arrow_forward
- Describe the structure and the role of the Sliding-Filament Mechanism?arrow_forwardHello, i understand the question, but i only need to know which option is right, no need for explanation. thanks in advance.arrow_forwardIf you were to watch muscle tissue contract: Under a light microscope, would you see the muscle fibers get narrower, or the striations get thinner? Explain. At the EM level, focusing on one sarcomere, you would be able to see a region of thick filaments overlapping two regions of thin filaments. Use the structure of the thick filaments to explain how ONE region of thick filaments is able to pull in microfilament in two opposite directions (both toward the center of the sarcomere).arrow_forward
- 45. Which of the following accurately represents how intermediate filaments differ from actin filaments and microtubules? Only intermediate filaments ... … a) interact with extracellular matrix components. b) associate with motor proteins. c) are composed of the same protein subunits in all cells. d) are polar with plus and minus ends. e) play a purely structural role.arrow_forwardCompare the rate of Ca2+ release from the sarcoplasmic reticulum to the rate of Ca2+ return back to the sarcoplasmic reticulum. Which of the following is true? The rate of ca2+ returns is faster than the rate of ca2+ release The rate of ca2+ release is faster than the rate of ca2+ return Rates of Ca2+ release from and return to the sarcoplasmic reticulum are the same.arrow_forwardDuring muscular contraction, cross-bridges form between _____ and _____ . Multiple Choice a) myosin, tropomyosin b) myosin, troponin c) troponin, calmodulin d) actin, tropomyosin e) actin, myosinarrow_forward
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