Answer:
Most prokaryotes lack well defined organelles.
Step-by-step explanation:
Prokaryotes are the unicellular organisms which have no true nucleus while eukaryotes have true nucleus. True nucleus means that the membrane is present around the nucleus and other organelles. Many organelles are also absent in prokaryotic cell such as mitochondria, cell wall, golgi bodies, endoplasmic reticulum, lysosomes, ribosome and vacuole.