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  • Which of the following statements about the molecular arrangement of actin and myosin in  myofibrils is/are incorrect ?  1) Each actin (thin filament) is made of 2F (filamentous

Which of the following statements about the molecular arrangement of actin and myosin in  myofibrils is/are incorrect ? 

1) Each actin (thin filament) is made of 2F (filamentous) actins 

2) F - actin is the polymer of G (globular) actin 

3) 2F - actins are twisted into a helix 

4) Two strands of tropomyosin (protein) lie in the grooves of F -actin 

5 ) Troponin molecules (complex proteins) are distributed at regular intervals on the tropomyosin . 

6) Troponin forms the head of the myosin molecule 

7) The myosin is a polymerised protien 

Option: 1

1,3 and 7 


Option: 2

2,4 and 5 


Option: 3

only 6 


Option: 4

only 3 


Answers (1)

As we have learned

Structure of Contractile Proteins -

Each actin (thin) filament is made of two ‘F’ (filamentous) actins helically wound to each other.

- wherein

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.

 

 

 

Posted by

Kshitij

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