Which of the following statements is/are correct?

F actin is a polymer of G actin

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Both F and G actins are monomers of actin

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G actin is a polymer of F actin

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Both F and G actins are polymers of actin

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Solution

The correct option is A F actin is a polymer of G actin
Muscle fibre contains several myofilaments. There are 2 types of myofilaments- thick filaments made up of myosin proteins and thin filaments made up of actin proteins. Actin and myosin are known as contractile proteins.
Structure of contractile proteins reveal that each F (filamentous) actin is a polymer of G (globular) actin. Each actin filament is made up of 2 F actins helically wound to each other.

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