Human vision can distinguish objects down to about a 4th of a millimeter (~250 micrometers). Given this, which of the following
are generally visible to the human eye? Proteins
Bacterial cell
Animal cell
Poxvirus Ribosomes
Plant cell
None of the above
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The human vision cannot see any of the listed cells. Plant and animal cells are always above the 250 micrometer size. In the same manner, all the listed cells are above this size and hence are very small for the bare eyes to see. In order to see these cells with any resolution, it is important to have a light microscope handy.
