Identify the organism that has the following feature:
(a) Smallest living cells known
(b) Insensitive to penicillin
(c) Contains only 70S ribosome.
Mycoplasma can have ds and linear DNA. As they are prokaryotes, they contain only 70S ribosomes. They lack cell wall and are therefore insensitive to penicillin. They are the smallest living cells known and can survive without oxygen.