Treadmilling refers to
A)myosin heads walking along actin microfilaments.
B)actin and myosin filaments sliding along each other.
C)actin monomers moving through a microfilament from the + end to the - end.
D)synthesis and degradation of actin monomers.
E)the interactions between actin and tropomyosin.

Question

Quizplus · Accepted Answer

Treadmilling refers to the process by which actin monomers are added to and simultaneously dissociated from the ends of an actin filament. This occurs when the concentration of free actin monomers is in equilibrium with the actin bound to filaments. As a result, actin monomers move through the filament from the + end to the - end, while actin and myosin filaments sliding along each other is characteristic of muscle contraction. Therefore, option C is the correct answer.

Treadmilling Refers to