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Which of the following statements about the molecular arrangement of actin and myosin in myofibrils is false?
I) Each actin (thin filament) is made of 2F (filamentous) actins
II) F-actin is the polymer of G (globular) actin
III) Two strands of tropomyosin (protein) lie in the grooves of F-actin
IV) Troponin molecules (complex proteins) are distributed at regular intervals on the tropomyosin.
V) Troponin forms the head of the myosin molecule

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I, III, IV

Only IV

Only V

Only III

answer is C.

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Detailed Solution

Globular head of meromyosin [myosin] is made up of heavy meromyosin. The globular head is an active ATPase enzyme and has binding sites for ATP and active sites for actin.

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