Question
Biology Question on biological classification
Which one of the following is a prokaryote ?
A
Entamoeba
B
Saccharomyces
C
Paramecium
D
E.coli
Answer
E.coli
Explanation
Solution
E. coli is Gram negative, rod shaped bacterium belonging to the kingdom of prokaryotes, i.e. Monera.Monera includes all prokaryotes, viz., mycoplasma, bacteria, actinomycetes (mycelial bacteria) and photosynthetic cyanobacteria. Plastids, mitochondria, endoplasmic reticulum, Golgi bodies, lysosomes and other membrane bound organelles are absent. The genetic material is naked circular DNA, neither enclosed by nuclear envelope nor complexed with proteins and without formation of well defined chromosomes. It is called nucleoid or genophore.