EVERYDAY SCIENCE

Detailed explanation-1: -E. coli is a well-studied prokaryotic cell. These lack true nucleus and membrane bound organelles lilke mitochondria, undifferentiated, unorganised fibrillar nucleus without any nuclear membrane in prokaryotic cells. The genetic material of prokaryotic cell is dispersed in cytoplasm and is known as nucleoid.

Detailed explanation-2: -coli is Gram-negative and its envelope has three layers: cytoplasmic membrane, peptidoglycan, and outer membrane. The peptidoglycan is rigid determining the rod shape. To a good approximation, the E. coli cell has hemispherical caps and a cylindrical section in between.

Detailed explanation-3: -Escherichia coli cells do not have a discrete nucleus, but they do have a loosely defined area at the center termed the nucleoid that contains most of the DNA.

Detailed explanation-4: -Assertion :The true nucleus is generally absent in prokaryotes. Reason: An undifferentiated, unorganised fibrillar nucleus is observed in prokaryotic cells.

Detailed explanation-5: -What organelle is missing from E. coli? Answer: It is nucleus.