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Are the ribosomes connected to the rough endoplasmic reticulum 80S or 70S ribosomes?

Are the ribosomes connected to the rough endoplasmic reticulum 80S or 70S ribosomes?

Thanks for your help! :smile:
Eukaryotes is 80 S
Reply 2
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kanra
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All eukaryotic ribosomes are 80s, regardless of whether they're free floating or bound to the ER. 70s is specific to prokarya (i.e. bacteria).
Ohh ok thanks was just a little confused as 70S ribosomes are found in the organelles like mitochondria so I was wondering if they were attached to the ER whether they'd be 70S or still 80S, I understand now thanks :smile:
Reply 4
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kanra
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Original post by funky386
Ohh ok thanks was just a little confused as 70S ribosomes are found in the organelles like mitochondria so I was wondering if they were attached to the ER whether they'd be 70S or still 80S, I understand now thanks :smile:


Oh, yeah. Mitochondria are a special case. It's thought that millions of years ago, prokaryotic cells were taken up into eukaryotic cells, and then formed chloroplasts and mitochondria. That's why a lot of their features are quite "bacterial-like" :smile:

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