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Physiology: Muscle Proteins and Myosin Molecule

14 Questions

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Physiology: Muscle Proteins and Myosin Molecule

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Questions and Answers

How many polypeptide chains compose myosin?

6 (correct)

What is the molecular weight of myosin?

360,000

480,000 (correct)

420,000

240,000

Where are the ATPase sites located in the myosin molecule?

In the globular heads

In the arm

Both in the tail

One head contains the sites of ATP hydrolysis (correct)

Which type of myosin is present in skeletal muscle?

Type 2 Signup and view all the answers

What is the molecular weight of actin?

42,000 Signup and view all the answers

What is the diameter of the I (Isotropic to light) band?

50 A° Signup and view all the answers

How is actin arranged structurally?

In long double helix form Signup and view all the answers

What protein is responsible for inhibiting the binding of actin and myosin?

Troponin I Signup and view all the answers

What is the role of titin in the muscle structure?

Forms rods that provide structural support Signup and view all the answers

What is the central H-zone characterized by?

It has lighter central H-zone (has no actin filaments) Signup and view all the answers

What causes longitudinal striations in the muscle fiber?

Longitudinal arrangement of the sarcomere Signup and view all the answers

Which protein connects the actin filaments to the Z lines?

Actinin Signup and view all the answers

What is the function of dystrophin-glycoprotein complex?

Provides structural support and strength to the muscle fiber Signup and view all the answers

What protein binds tropomyosin?

Troponin T Signup and view all the answers