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PART - 2 - Unit V : CH - 17 Locomotion and Movement — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYPART - 2 - Unit V : CH - 17 Locomotion and Movement5 Marks
Question
Write the difference between:
Actin and Myosin
✓

Answer

Differences between Actin and Myosin
S. No.ActinMyosin
1.Actin filaments are thin.Myosin filaments are thick.
2.Actin is a protein with a lower molecular weight. (Molecular weight: 60,000)Myosin is a protein with a higher molecular weight. (Molecular weight: 500,000)
3.Actin's molecule is in a globular G-protein form.Myosin molecule's shape is similar to a tadpole.
4.G-actin units polymerize into F-actin (Fibrous actin) in the presence of salt and ATP.Myosin protein is divided by the proteolytic enzyme trypsin into two parts-(i) Heavy meromyosin and (ii) Light meromyosin.
5.Calcium is found in actin filaments as Calcium Actinate, with four Cat ions in one unit.Myosin filaments contain Magnesium Myosinate, with one Mgt ion in one unit.
6.Each actin filament is surrounded by three myosin filaments.Each myosin filament is surrounded by six actin filaments.

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