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Question:

Skeletal muscles appear striated due to the presence of two characteristic proteins in alternating dark and light bands. Which of the following is a correct match of the protein with its light refractive property and color?

Protein : Myosin, Colour : Light, Property : Anisotropic

Protein : Actin, Colour : Light, Property : Isotropic

Protein : Actin, Colour : Dark, Property : Anisotropic

Protein : Myosin, Colour : Dark, Property : Isotropic

Solution:

Each actin (thin) filament is a polymerised protein made up of two 'F' (fibrous) actin strands helically wound to each other. Each "F" actin is a polymer of monomeric "G" (globular) actins. It is light in colour and shows isotropic property.