This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Microbiology
Each myosin molecule of sarcomere is composed of 
Select and explain. 
A. Two monomers, B. Four monomers, C. Six monomers, D. Eight monomers
C: Six monomers
Answer: C: Six monomers 
Explanation: Sarcomeres are the fundamental contractile unit of skeletal muscle and are characterized by their highly ordered appearance under a polarizing light microscope.Thick filaments in the A band are composed primarily of the protein myosin. Each myosin molecule is composed of six monomers: two protein strands intewined in a helical arrangement (termed heavy chains) and four smaller, globular proteins (termed myosin light chains).Thin filaments are composed of three primary proteins: actin, tropomyosin, and troponin.