Actin filaments in microvilli require the help of myosin so that they can associate with the microvilli cellular membrane. What type of myosin is utilized for membrane association? Myosin VII Myosin II Myosin I Myosin VI

Actin filaments in microvilli require the help of myosin so that they can associate with the microvilli cellular membrane. What type of myosin is utilized for membrane association? Myosin VII Myosin II Myosin I Myosin VI

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter43: Muscles, Bones, And Body Movements

Section: Chapter Questions

Problem 3TYK

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Concept explainers

Muscle Action

A change in the body or a bodily organ as a result of its functioning is referred to as an action. Muscle action can be defined as the specific movement of a bodily part generated by the contraction of a muscle. The muscle proteins actin and myosin are the important contractile proteins involved in muscle action. Muscle contraction, in addition to movement, serves several other important functions in the body, including posture, heat generation, and joint stability. Muscle contraction maintains posture, which includes standing and sitting.

Question

Actin filaments in microvilli require the help of myosin so that they can associate with the microvilli
cellular membrane. What type of myosin is utilized for membrane association?
Myosin VII
Myosin II
O Myosin I
O Myosin VI

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The _____ is the basic unit of muscle contraction. a. myofibril b. sarcomere c. muscle fiber d. myosin filament
Myosin II has a duty ratio of 10 percent, and its step size is 8 nm. In contrast, myosin V has a much higher duty ratio (about 70 percent) and takes 36-nm steps as it walks down an actin filament. What differences between myosin II and myosin V account for their different properties?
Which of the following statements are true? (choose all that apply) The Z-disc is found in the middle of an l-band Myosin are known as the thick filaments The A-band is seen as "dark" under the microscope Tropomyosin is on the Actin filament During a muscle contraction, the sarcomeres move farther apart A sarcomere is located from one H-zone to the following H-zone
Certain multi-headed myosins bind cooperatively to actin filaments. The binding interaction is mainly electrostatic in nature, so the presence of additional salt (ions) in solution can interfere with binding; ions will tend to associate with charged residues on the two proteins, blocking electrostatic attractions that would otherwise take place. Briefly describe the expected shape of the binding curve for one of these myosins, and what will happen to the shape when the salt concentration increases.
What is the main order histological structure of sarcomere? * Z line bind with actine without interaction with myosin Interaction of actine and myosin with Z line Interaction of myosin and actine with Z line Interaction of Z line with myosin and actine
Which of the following proteins connects the actin filaments to the Z-band in the sarcomere? CapZ Titin Profilin Nebulin O Tropomodulin < Previous
Myosin filaments iterdigitate with actin filaments in order to bring about muscle contraction. Provide below the 5 steps that are required for Myosin to move along actin.
What prevents the filaments from sliding back to their original position each time a myosin cross bridge detaches from actin?
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?
Identify the structures within this sarcomere. A band M line Z line Myosin H zone I band Actin H |||
1. a) Why are muscles not in a contracted state all the time? b) Several hours after the death of an animal, a state of rigor mortis, extreme rigidity of the body, occurs. With respect to myosin and actin filaments, why does this occur? What causes the body to relax more later in time? Explain.
Why is myosin II the only myosin capable of producing contractile force?