Mutualism is when both sides benefit. The hummingbird gets nectar and the flower is benefited because the hummingbird that has been to other flowers carry pollen on its body which spread the flower when it sucks its nectar, therefore pollinating the flower in the process.
The prokaryotes and eukaryotes have cell membranes that enclose the cell organelles. The prokaryotes lack nuclear membrane, membrane bound organelles like the chloroplasts and also golgi apparatus.
