Although there is wide variation in the. size and shape of bacterial and archaeal cells, all such cells contain a. plasma membrane, chromosomes, and ribosomes; almost all have a. stiff cell wall. Some prokaryotes have flagella and/or inner.
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, Reconciler X Observer X Life Science Fanatic. Genus Panthera consists of cats which are able to roar, owing to their massive vocal chords and an incompletely developed horse shoe shaped elastic bone in throat enabling them to amplify low pitched roars by expanding wind pipes. This bone is known as Hyoid Apparatus.