When Electron Micrographs Were First Taken of the Cell Interior

Multiple Choice

When electron micrographs were first taken of the cell interior, what kinds of structures were seen?

A) membrane-bound vesicles of varying diameter, containing material of different electron density
B) long channels bounded by membranes and radiating through the cytoplasm
C) an interconnected network of canals
D) stacks of flattened, membrane-bound sacs called cisternae
E) all of these are correct