14 Questions
How many polypeptide chains compose myosin?
6
What is the molecular weight of myosin?
480,000
Where are the ATPase sites located in the myosin molecule?
One head contains the sites of ATP hydrolysis
Which type of myosin is present in skeletal muscle?
Type 2
What is the molecular weight of actin?
42,000
What is the diameter of the I (Isotropic to light) band?
50 A°
How is actin arranged structurally?
In long double helix form
What protein is responsible for inhibiting the binding of actin and myosin?
Troponin I
What is the role of titin in the muscle structure?
Forms rods that provide structural support
What is the central H-zone characterized by?
It has lighter central H-zone (has no actin filaments)
What causes longitudinal striations in the muscle fiber?
Longitudinal arrangement of the sarcomere
Which protein connects the actin filaments to the Z lines?
Actinin
What is the function of dystrophin-glycoprotein complex?
Provides structural support and strength to the muscle fiber
What protein binds tropomyosin?
Troponin T
This quiz covers the contractile protein Myosin, including its structure, composition, and functional sites such as actin binding heads and ATPase site. It also discusses the formation of myosin molecules and the arrangement of heavy and light chains.
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