During ultracentrifugation, the ER and bodies associated with it are separated as a fraction known as

Microsome

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Polysome

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Quantosome

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Episome

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Solution

The correct option is A Microsome
Microsome fraction is obtained by ultracentrifugation of cell contents. When post-mitochondrial supernatant is subjected to a centrifugal force of 50000 x g for two hours; Microsomal fraction settles down. The fraction includes microsomes, endoplasmic reticulum, Golgi bodies etc. Microsomes are broken pieces of ER often with attached ribosomes.

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