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Assume that a spherical mammalian cell has a diameter of 27 microns.If a polypeptide chain with alpha helical conformation has to stretch across the cell,then how many amino acids should it be comprised of ?

​a.18000    b.1800    c.27000  d.12000
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18000 is the right answer
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This question need some knowledge, like gap between 2 turns is 5.4 A°and 1 turn of @helix contains 3.6 amino acids! Hope you get it! All the best

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