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.
Chloroplasts are surrounded by a single membrane. Mitochondria are surrounded by a single membrane. Mitochondria are the organelles involved in cellular respiration. The cilia and flagella of eukaryotic cells are composed of _____. microtubules. intermediate filaments. microfilaments. pili. tonofilaments. Choose the letter that indicates the organelle that contains most of a cell's DNA.