Which of the following statements regarding kinesin are TRUE? (More than one answer is correct) Group of answer choices The majority of kinesin family members move along microtubules toward the (-) end Differential affinity of ATP- and ADP-bound kinesin for microtubules is important for kinesin walking The coiled-coil structure that links the two myosin motor proteins unwind after each step, requiring kinesin to periodically pause during transport and reenergize using ATP hydrolysis Kinesin movement is reminiscent of an inebriated individual walking (and carrying a balloon!)

Which of the following statements regarding kinesin are TRUE? (More than one answer is correct) Group of answer choices The majority of kinesin family members move along microtubules toward the (-) end Differential affinity of ATP- and ADP-bound kinesin for microtubules is important for kinesin walking The coiled-coil structure that links the two myosin motor proteins unwind after each step, requiring kinesin to periodically pause during transport and reenergize using ATP hydrolysis Kinesin movement is reminiscent of an inebriated individual walking (and carrying a balloon!)

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter8: Muscle Physiology

Section: Chapter Questions

Problem 2TAHL

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The ability of myosin to walk along an actin filament may be observed with the aid of an appropriately equipped microscope. Describe how such assays are typically performed. Why is ATP required in these assays? How can such assays be used to determine the direction of myosin movement or the force produced by myosin?
There are no known motor proteins that move along intermediate filaments, in contrast to the variety of such proteins that associate with microtubules and actin filaments. What characteristic of intermediate filaments, in their polymerized form, might explain the absence of associated motor proteins? Briefly explain your reasoning.
Which of the following molecular motors is known to travel in an anterograde direction along microtubules? myosins kinesins myosins and dyneins dyneins
Neurofilament proteins assemble into long, intermediate filaments , found in abundance running along the length of nerve cell axons. The C-terminal region of these proteins is an unstructured polypeptide, hundreds of amino acids long and heavily modified by the addition of phosphate groups. The term “polymer brush” has been applied to this part of the neurofilament. can you suggest why?
During the cross-bridge in muscle cells, myosin motors hydrolyzes ATP as a fuel to create a pulling force on actin fibers. Please describe1) the myosin motors undergo different steps of ATP hydrolysis2) the state of the ATP nucleotide affects the binding and position of the myosin motor with respect to the actin fiber
Which of the following if true of kinesin? Select one: a. It is protein involved in transport via diffusion. b. It is a sugar that can bind to microtubules c. It is an enzyme that has affinity for intermediate filaments d. none of the above e. It was a binding site for actin Clear my choice
The sarcoplasmic reticulum Ca2+-ATPase, pumps 2 mol Ca2+ out of sarcomeres per mol ATP hydrolyzed.(a) Given the following steady-state concentrations and a membrane potential of 65 mV (inside negative), calculate ΔG for the following activetransport process at 37 °C and pH = 7.4:2Ca2+(in) + ATP + H2O → 2Ca2+(out) + ADP + Pi + H+ATP = 2.6 mM, ADP = 210 μM, Pi = 5.1 mM, Ca2+(in) = 32 mM,Ca2+(out) = 2.2 mM(b) In active muscle the pH can drop below 7.4. Is the reaction above moreor less favorable under these conditions?(c) The activity of the Ca2+-ATPase is regulated reversibly under normalconditions to maintain homeostatic concentrations of Ca2+ inside thesarcomere. However, in a rare genetic disorder, irreversible activation ofthe Ca2+ -ATPase can occur. Assuming 37 °C, pH = 7.4, and the steadystate concentrations for ATP, ADP Pi, and Ca2 +(out) given in part (a),calculate the minimum [Ca2 +] inside a sarcomere that has irreversibly activated Ca2 +-ATPase (i.e., the Ca2 +-ATPase…
Actin filaments have polarity. The plus end is the end to which subunits are added more rapidly, or the end of polymerization. Which of the following would enable you to identify the plus end of actin filaments? A. Adding radiolabeled actin subunits to a mixture of actin filaments in which conditions favor depolymerization B. Adding radiolabeled actin subunits to a mixture of actin filaments in which conditions are favorable for polymerization C. Determining the ionic charge of the ends of the actin filaments D. None of the above
Select the correct statement regarding the actin cytoskeleton. They are involved in the formation of the axoneme. Actin microfilaments are the most stable cytoskeleton network. Can undergo catastrophe due to GTP hydrolysis-mediated conformational changes. Synthesis and degradation of actin microfilaments is directional, with g-actin subunits added only to the + end of the microfilament while depolymerization occurs at the - end. From the list below, select the correct statements regarding the genetic code. Codons code for 30 distinct amino acids. The basis of the genetic code are codons. The genetic code has a possible 64 different codons. The genetic code has built-in degeneracy. Codons are formed by 5 consecutive nucleotides.
What is the reaction catalyzed by the ATPase domain of myosin?
Why is myosin II the only myosin capable of producing contractile force?
Why is it that intermediate filaments have iden-tical ends and lack polarity, whereas actin filaments andmicrotubules have two distinct ends with a defined polar-ity?