An alkene is a hydrocarbon containing double bonds. An alkyne is a hydrocarbon containing triple bonds. Ethene, C 2 H 4, is an example of an unsaturated hydrocarbon with a double bond.ethyne (acetylene), C 2 H 2 is an example of an unsaturated hydrocarbon with a triple bond.thene, C 2 H 4, is an example of an unsaturated hydrocarbon with a double bond. ethyne (acetylene), C 2 H 2 is an example of an unsaturated hydrocarbon with a triple bond.
Mitochondria and chloroplasts are also surrounded by membranes, but they have unusual membrane structures â specifically, each of these organelles has two surrounding membranes instead of just one. The outer membrane of mitochondria and chloroplasts has pores that allow small molecules to pass easily.
For example, all eukaryotes have complex organelles, including a cytoskeleton, a membrane-bound nucleus and other membrane-bound organelles like mitochondria, the Golgi apparatus and chloroplasts.They also have relatively large cells, generally much larger than bacterial cells.or example, all eukaryotes have complex organelles, including a cytoskeleton, a membrane-bound nucleus and other membrane-bound organelles like mitochondria, the Golgi apparatus and chloroplasts.