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Home  >>  JEEMAIN and AIPMT  >>  Biology  >>  Human Physiology
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Structure of Contractile Proteins (Actin) : Each actin filament is made of two ________ (C) helically wound to each other. Each ________ (C) is a polymer of monomeric ____________. Two filaments of another protein, ___________ (B) also run close to the ____________ (C) throughout its length. In the resting state a subunit of ___________ (A) masks the active binding sites for myosin on the actin filaments

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( a ) ‘F’actins ; ‘F’ actin, ‘G’actins; tropomyosin, ‘F’ actins; troponin
( b ) ‘F’actins ; ‘F’ actin, ‘G’actins; troponin, ‘F’ actins; tropomyosin
( c ) ‘G’actins ; ‘G’ actin, ‘F’actins; tropomyosin, ‘G’ actins; troponin
( d ) ‘G’actins ; ‘G’ actin, ‘F’actins; troponin, ‘G’ actins; tropomyosin
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(A) is the right answer.

Structure of Contractile Proteins (Actin) : Each actin (thin) filament is made of two ‘F’ (filamentous) actins helically wound to each other. Each ‘F’ actin is a polymer of monomeric ‘G’ (Globular) actins. Two filaments of another protein, tropomyosin also run close to the ‘F’ actins throughout its length. A complex protein Troponin is distributed at regular intervals on the tropomyosin. In the resting state a subunit of troponin masks the active binding sites for myosin on the actin filaments
answered Mar 26, 2014 by pady_1
 

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