Which of these has only prokaryotic cells?

a)
fungi

b)
plants

c)
animals

d)
bacteria

Option D

Explanation:

The characteristics of bacterial cell are similar to that of prokaryotic cell. Just like a prokaryote, a bacterial cell lack nucleus, membrane bound organelles, is unicellular, has a single chromosome, cell structures such as endoplasmic reticulum & mitochondria are absent, ribosomes are of smaller size etc.  

While in all other options i.e plants, animals, and fungi all the above features are different or varying as compared to a prokaryotic cell.  

Thus, option D is correct

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