Question

what structure is #3? it has ribosomes attached and is the site where proteins are modified and shaped into proteins by ribosomes. nucleus cell membrane centriole rough e.r. (endoplasmic reticulum)

Explanation:

The rough endoplasmic reticulum has ribosomes attached to its surface and is involved in protein modification and synthesis by ribosomes. The nucleus contains genetic material, the cell - membrane is the outer boundary of the cell, and centrioles are involved in cell division.

Answer:

D. rough E.R. (endoplasmic reticulum)