Question

Which one is a prokaryote?
A) Entamoeba
B) Saccharomyces
C) Paramecium
D) E.coli

Answer 1

Hint: Prokaryotes are unicellular organisms without membrane-bound organelles like mitochondria, Golgi complex.

Complete Answer:
- The prokaryotic cells are represented by bacteria, blue-green algae, Mycoplasma, Pleuropneumonia-like organisms.
- They are generally smaller in size and multiply much faster than the eukaryotic cells.
- They may vary greatly in shape and size but exhibit a similar basic cellular organization. The organization of the prokaryotic cell is fundamentally similar even though prokaryotes exhibit a wide range of shapes and functions.
- Most prokaryotes have a cell wall surrounding the cell membrane. They lack a true nucleus. Now consider the options provided,

1) Entamoeba: Entamoeba are pseudopod-forming, protozoan parasites in the phylum Amoebozoa, class Archamoebae, and family Entamoeba. Being a parasite, this option is incorrect.

2) Saccharomyces: Streptococcus is a prokaryotic organism. It is the most important genus of Gram-positive bacteria with many species and has great medical importance. Thus All except Streptococcus are eukaryotes, this is the correct option available.

3) Paramecium: Paramecium is a unicellular organism with a shape resembling the sole of a shoe. It is mostly found in a freshwater environment. It is a single-celled eukaryote belonging to the kingdom Protista and is a well-known genus of ciliate protozoa. Thus, this option is also incorrect as it is a eukaryote.

4) E.coli: Escherichia coli (E.coli) is a bacteria that can be very easily found in the gut of humans and animals having warm blood. Most strains of E. coli are harmless. This option is also incorrect.

Note: No organelles, like the ones in eukaryotes, are found in prokaryotic cells except for ribosomes.