Which of the following is the simplest living organism?
A.
Paramecium
B.
Virus
C.
Amoeba
D.
Chlamydomonas
Correct Answer: Option B
Explanation
If viruses, prions, satellites, nanobes, nanobacteria (non-free-living sub-bacterial organisms) are excluded, the simplest free-living organism known is Mycoplasma genitalium, with a genome of only 580,000 base pairs and 482 protein-coding genes.
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