Multiple choice Which of the following groups of organisms is prokaryotic? Green algae, brown algae<font size="2"> and</font> red algae Yeasts and other fungi Mycoplasma, bacteria and cynobacteria Bacteria, yeast and virus Reveal answer Fill a bubble to check yourself C Correct answer Explanation The organisms that do not possess a well-defined nuclear membrane are called prokaryotes. For example, mycoplasma, bacteria and cyanobacteria.