The following is FALSE about actin polymerization: a. F-actin with ADP bound is removed from the end of an actin filament b. G-actin with ATP bound is removed from the end of a depolymerizing actin filament c. None of the answers d. F-actin with ADP bound is required. for depolymerization of an actin filament e. G-actin with ATP bound is added to the + end or growing end of an actin filament

The following is FALSE about actin polymerization: a. F-actin with ADP bound is removed from the end of an actin filament b. G-actin with ATP bound is removed from the end of a depolymerizing actin filament c. None of the answers d. F-actin with ADP bound is required. for depolymerization of an actin filament e. G-actin with ATP bound is added to the + end or growing end of an actin filament

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

See similar textbooks

Similar questions

What would be the consequence for actin filament assembly/disassembly if a mutation prevented actin’s ability to bind ATP? What would be the consequence if a mutation prevented actin’s ability to hydrolyze ATP?
Shortly after a person dies, Ca2+diffuses out of the saroplasmic reticulum and the body becomes very still and rigid, a phenomenoncalled rigor mortis (rig′er mōr′tis). Given ATP’s role in myosin head movement, propose an explanation for rigor mortis.
Shortly after a person dies, Calcium ions diffuse out of the sarcoplasmic reticulum and the body becomes very stiff and rigid, a phenomenon called rigor mortis (stiffness + death). Given ATP’s role in myosin head movement, propose an explanation for rigor mortis.
Would you expect to find motor proteins that move along intermediate filaments? Explain why or why not.
ATP within actin subunits is hydrolyzed after assembly into a filament but before disassembly from a filament. in theprocess of assembly into a filament. in the process of disassociation from a filament after disassociation from a filament
During an experiment, the protein troponin from a skeletal muscle fiber was removed. This resulted in the permanent exposure of the actin binding site. Predict how cross-bridge cycling in this skeletal muscle fiber would be affected in the absence of troponin.
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?
What prevents the filaments from sliding back to their original position each time a myosin cross bridge detaches from actin?
The Sarcomere 2 Thin filaments are often named for which protein? a. actin b. myosin c. troponin d. tropomyosin
With regard to muscle contraction, which of the following is an INCORRECT statement with regard to the interactions of filaments that occur in the sarcomere? A. When muscles are relaxed tropomyosin blocks binding sites on actin subunits, which keeps cross-bridges from forming. B. The myosin heads conduct a power stroke motion to slide when bound to actin, to move the "thin" filaments towards the center of the sarcomere. C. During contraction, actin subunits are removed from the ends of the "thin" filaments to shorten actin polymers, thus reducing the length of the sarcomere. D. "Thick" filaments are anchored at the M-line, while "thin" filaments are anchored at the Z-line. E. Numerous myosin heads engage with the actin filaments simultaneously, such that there is no back-slipping during the contraction process.
This thick filament motor protein composed of 6 polypeptide chains uses ATP hydrolysis to interact creating a powerstroke for skeletal muscle contractions. A Myosin B Actin C Titin D Tropomyosin
Name and describe the function of the two regulatory proteins on the actin thin filament muscle.