Question

part a
the nucleus, plasma membrane and ____ are the three major regions of cells that can readily be seen with a light microscope.
organelles
cytoplasm
cytosol
cell fluid

Explanation:

The three major regions of cells visible with a light microscope are the nucleus, plasma membrane, and cytoplasm. Organelles are substructures within cytoplasm, cytosol is the fluid component of cytoplasm, and cell fluid is an imprecise term.

Answer:

B. cytoplasm