AP Biology help? PLEASE!!?

G

Ginny

New member
Which of the following correctly lists the order in which cellular components will be found in the pellet when homogenized cells are treated with increasingly rapid spins in a centrifuge?

A) ribosomes, nucleus, mitochondria
B) chloroplasts, ribosomes, vacuoles
C) nucleus, ribosomes, chloroplasts
D) vacuoles, ribosomes, nucleus
E) nucleus, mitochondria, ribosomes

Thanks! ^^
 
The answer is E, the largest components of the cells will spin out first, so that means the heavy nucleus will fall to the bottom first, then the mitochondria, then the tiny ribosomes.
 
Its E.
Nucleus is very dense and heavy. so at a relatively lower speed it settles down. then comes mitochondria. Ribosomes are very light tiny organelles and so they require greater centrifuge speed to settle down and hence will be last. by the way, the method of "increasingly rapid spins in a centrifuge" is known as differential centrifugation, used to separate cellular organelles...
 
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