Question

what is a protein that is the main component of the thick filaments in muscle fibers and is responsible for muscle contraction?
actin
myosin
atp
dna

Explanation:

Myosin is the main protein in the thick filaments of muscle fibers and plays a key - role in muscle contraction. Actin is in thin filaments. ATP is an energy - carrier molecule, not a main filament protein. DNA is the genetic material, not related to muscle filament structure for contraction.

Answer:

B. myosin