A. Paramecium
B. Virus
C. Amoeba
D. Chlamydomonas
Correct Answer:
Option B – Virus
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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