Question:
Difference in gram ⊕ and gram bacteria is due to
Difference in gram ⊕ and gram bacteria is due to
Updated On: Mar 28, 2024
- Cell wall
- Cell membrane
- Ribosome
- Cytoplasm
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The Correct Option is A
Solution and Explanation
The difference between Gram-positive (Gram +) and Gram-negative (Gram -) bacteria is primarily due to differences in their cell wall structure.
So, the correct option is (A): Cell wall
Gram-positive bacteria have a thick layer of peptidoglycan in their cell walls, which retains the crystal violet stain used in the Gram staining procedure, giving them a purple or blue-violet color under a microscope.
Gram-negative bacteria have a thinner layer of peptidoglycan in their cell walls, which does not retain the stain effectively. Instead, they have an outer membrane composed of lipopolysaccharides that can interfere with staining, giving them a pink or red color during Gram staining.
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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.