Which Statement About Muscle Contractile Proteins Is True

question 101

Multiple Choice

Which statement about muscle contractile proteins is true?

• A) Three chains of actin monomers twisted together form an actin filament.
• B) A molecule of myosin consists of two long linear polypeptide chains each with a globular head.
• C) A myosin filament consists of a single myosin molecule with its heads projecting at the ends of the filament.
• D) The polypeptides that make up actin have globular heads.
• E) Tropomyosin twists around the myosin molecule.

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