Which of the following are prokaryotic cells?
Prokaryotes are very small cells that have no membrane around their nucleus nor any organelles. Prokaryotes include bacteria. They are the simplest organisms on Earth, and also the commonest. Every part of your skin is smothered in them. Their spores fill the air we breathe. Every glass of water we drink, even good clean drinking water, contains millions of them. On the outside they have a strong cell wall. Beneath this is a membrane which will allow oily molecules to pass but prevents electrically charged molecules, and free protons and electrons, from passing through. Beneath this is a watery space full of molecules and ribosomes, messenger nucleic acids and all the other things needed to keep life going, all mixed up in a mostly chaotic way. There are some organelles within the cell, which function as storage compartments, but these do not have a membrane surrounding them as they do in eukaryotes. Instead they are surrounded by a protein coat. At the center of the prokaryote is the
