Are there any marker enzymes present for ribosomes, nucleus and cell membrane. For mitochondria there are many, for lysosome it's cathepsin. I read about the marker enzymes of most of the other cellular components, but no information is there on these three. If no marker enzymes are present then how are ribosomes, nucleus and cell membrane are identified.
I am specifically looking for marker enzymes which can help identify the pellet component after subcellular fractionation.