Question:
: The true nucleus is generally absent in E. coli and other prokaryotes
: An undifferentiated, unorganized fibrillar nucleus without any limiting membrane is observed in prokaryotic cells
: The true nucleus is generally absent in E. coli and other prokaryotes
: An undifferentiated, unorganized fibrillar nucleus without any limiting membrane is observed in prokaryotic cells
Updated On: Jul 28, 2022
- If both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
- If both Assertion and Reason are true but the Reason is not the correct explanations of Assertion.
- If Assertion is true, but Reason is false.
- If both Assertion and Reason are false.
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The Correct Option is A
Solution and Explanation
E. coli is a well-studied prokaryotic cell. Prokaryotic cell lacks true nucleus and membrane bound organelles like mitochondria. Chloroplast, E.R., Golgi body etc. There are an 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.
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Concepts Used:
Prokaryotic Cells
Prokaryotic cells are single-celled microorganisms known to be the earliest on earth. Prokaryotes include Bacteria and Archaea. The photosynthetic prokaryotes include cyanobacteria that perform photosynthesis.
A prokaryotic cell contains a single membrane and therefore, all the reactions occur within the cytoplasm. They can be free-living or parasites.
Characteristics of Prokaryotic Cell:
Prokaryotic cells have different characteristic features such as:
- Lack of a nuclear membrane.
- Absence of Mitochondria, Golgi bodies, chloroplast, and lysosomes.
- Presence of genetic material on a single chromosome.
- Lack of histone proteins in the constituents of eukaryotic chromosomes.
- The cell wall is made up of carbohydrates and amino acids.
- The plasma membrane acts as the mitochondrial membrane carrying respiratory enzymes.