Question

which of the following is not a membranous organelle? multiple choice endoplasmic reticulum mitochondrion nucleus ribosome golgi complex

Explanation:

Membranous organelles have a membrane - bound structure. The endoplasmic reticulum has a network of membranes, mitochondria have a double - membrane structure, the nucleus is surrounded by a nuclear membrane, and the Golgi complex has a stack of membrane - bound sacs. Ribosomes are non - membranous organelles responsible for protein synthesis.

Answer:

Ribosome