Question

Which one of the following option gives the correct categorisation of structure of contractile proteins ?

	Actin	Myosin
1	Troponin	Actinin
2	Troponin tropomyosin	HMM and LMM
3	'G' - actin	Tropomyosin
4	Tropomyosin troponin	$C{a}^{++}$ binding site

• A. 1
• B. 2
• C. 3
• D. 4

Answer 1

The correct option is A 1

Troponin is attached protein tropomyosin and lies within the groove between actin filaments in the muscle tissue. The calcium attaches the troponin which changes the shape exposing binding sites for myosin on the actin filament. So the correct answer is 1.