Question

Ribosomes are found attached to the surface of ___.

Answer 1

$\bullet$ Ribosomes are either found free-floating in the cytoplasm or attached to the surface of endoplasmic reticulum or ER.
$\bullet$ If ribosomes are found attached to the endoplasmic reticulum, it is called rough endoplasmic reticulum or RER. The endoplasmic reticulum without ribosomes are called smooth endoplasmic reticulum or SER.
$\bullet$ RER is associated with protein synthesis and SER is associated with lipid sythesis. The given image represents RER.