The major structural difference between the rough endoplasmic reticulum (RER) and the smooth endoplasmic reticulum (SER) is:
the rough ER is tubular and the smooth ER is flat
the rough ER is on the outside of the cell and the smooth ER is in the inside of
the cell
the rough ER is part of the endomembrane system and the smooth ER is not
the rough ER has ribosomes attached and the smooth does not
the rough ER has mitochondria connected to it and the smooth ER has
chloroplasts connected to it

hey bro i looked it up on google the structure of the eye-spot in euglena viridie, e. ehrenbergii, and phacus pyriyorme is not as franzé haa described it. the so-called “crystal body” and “lens bodies” were not found in any of the individuals of the species examined by me. as earlier observers have stated, the eye-spot consists simply of a mass of pigment granules arranged in a single layer, and probably embedded in a protoplasmic framework, but the latter could not be seen, and its presence was only inferred from the fact that the pigment granules must be held together in some way, thd the eye-spot as a whole is capable of expansion, and that the pigment granules can be separated from each other.

hope this   and an i get brainlsiest