Which of the following is TRUE of myosin?
1) It is located in the A band of the sarcomere.
2) It binds to tropomyosin during contraction.
3) It forms thick filaments.
4) The molecules are helix shaped.
A) 1, 2, 3, 4
B) 1, 2, 3 only
C) 1, 3 only
D) 2, 4 only

Question

Which of the following is TRUE of myosin? 
1) It is located in the A band of the sarcomere.
2) It binds to tropomyosin during contraction.
3) It forms thick filaments.
4) The molecules are helix shaped.
A) 1, 2, 3, 4
B) 1, 2, 3 only
C) 1, 3 only
D) 2, 4 only

Quizplus · Accepted Answer

1) Myosin is indeed located in the A band of the sarcomere, where it forms the thick filaments. 3) It forms thick filaments, which are crucial for muscle contraction by interacting with actin filaments. Myosin does not bind to tropomyosin; it binds to actin when the muscle contracts. Myosin molecules are not helix-shaped; instead, they have a tail and two heads, which are involved in binding to actin and ATP hydrolysis.

Which of the Following Is TRUE of Myosin