Question

question 1
the rough er is the portion of the er that
○ is the oldest; it was once the smooth er.
○ has ribosomes attached to it.
○ lacks ribosomes and is the site of steroid synthesis.
○ is connected to the mitochondria within the endomembrane system.

Explanation:

Rough endoplasmic reticulum (ER) gets its name from the distinct structure of having ribosomes attached to its outer membrane surface. The other options are incorrect: rough ER is not derived from smooth ER, smooth ER lacks ribosomes and handles steroid synthesis, and the ER is not connected to mitochondria in the endomembrane system.

Answer:

has ribosomes attached to it.