Write differences between
(a) Actin and Myosin

Solution

Actin	Myosin
1. It is thin low molecular weight filamentous protein present in the sarcomere.	1. It is thick filamentous protein present in the sarcomere.
2. It occurs in two forms the monomeric G-actin and polymeric F-actin.	2. Each myosin molecule has two components—a tail and head. The tail is formed of heavy meromyosin (HMM) while the head is formed of light meroyosin LMM.
3. The contractile protein called tropomyosin.	3. The head has contractile property.
4. It does not act as ATPase	4. The head acts as ATPase.

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