Aculture of human cells had its cell surface membranes removed, releasing the cell contents.
this material became contaminated by bacteria.
the material was then centrifuged, separating out the various cell structures according to size
and mass.
which cell structure would be separated out along with the bacteria?

a. endoplasmic reticulum
b. ribosomes
c. nuclei
(d. mitochondria) is correct, but why is it the mitochondria? ?