Question

question 3
actin myofilaments:
a contain both myosin and tropomyosin
b are held in place by the m line
c are the thickest proteins in muscle
d resemble bundles of minute golf clubs
e contain strands of fibrous actin

Explanation:

• Option A: Actin myofilaments do not contain myosin. Myosin is in the thick filaments.
• Option B: Actin myofilaments are held in place by the Z - line, not the M - line.
• Option C: Myosin filaments are thicker than actin filaments.
• Option D: Myosin heads resemble bundles of minute golf clubs, not actin myofilaments.
• Option E: Actin myofilaments contain strands of fibrous (F - actin), which is made up of two strands of globular (G - actin) twisted together.

Answer:

E. contain strands of fibrous actin