Membranes can be found in all of the following EXCEPT . A Option A: a ribosome B Option B: a mitochondrion C Option C: a nucleus D Option D: a chloroplast

The correct answer is A. ribosomes

Explanation:

Eukaryotic cell contains both membranous and non-membranous organelles. The membranous organelles are the nucleus, endoplasmic reticulum, Golgi apparatus, chloroplast(plants), mitochondria, lysosomes, etc.

Ribosomes, centrosomes are the non-membranous structures. Ribosomes are found in both eukaryotic and prokaryotic cells. In prokaryotes 70s ribosomes are present and in eukaryotes 80s ribosomes are present. Prokaryotes do not have a membrane-bound nucleus and organelles.

Ribosomes helps in protein synthesis in both prokaryotes and eukaryotes. Therefore the right answer is the ribosome.

d) center of the mid-ocean ridge

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