Which of the Following Statements About the Molecular Arrangement of Actin

question 66

Multiple Choice

Which of the following statements about the molecular arrangement of actin and myosin in myofibrils is false?

• A) A thin filament consists of actin and tropomyosin.
• B) Two chains of actin monomers are twisted into a helix.
• C) Two strands of tropomyosin lie in the grooves of the actin.
• D) Troponin forms the head of the myosin molecule.
• E) The myosin heads have ATPase activity and interact with the actin.

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