Prokaryotic Cells YouTube Lecture Handouts for Olympiad

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Watch video lecture on YouTube: Prokaryotic Cell: Shape, Structure, Gram Positive & Gram Negative Bacteria

Prokaryotic Cell: Shape, Structure, Gram Positive & Gram Negative Bacteria

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Prokaryotic Cells

Shape, Structure & Components Gram Positive and Gram Negative Bacteria

Gram-positive Cells

In Gram-positive bacteria, peptidoglycan makes up as much as 90% of the thick cell wall enclosing the plasma membrane.

Two groups of bacteria devoid of cell wall peptidoglycans are the Mycoplasma species, which possess a surface membrane structure, and the L-forms that arise from either Gram-positive or Gram-negative bacterial cells that have lost their ability to produce the peptidoglycan structures.

Image of Prokaryotic Cells

Image of Prokaryotic Cells

Image of Prokaryotic Cells

Gram Positive Bacteria For Prokaryotic Cells

Gram Positive Bacteria

Gram Positive Bacteria For Prokaryotic Cells

Gram Positive and Gram Negative Bacteria For Prokaryotic Cells Image

Gram Negative Bacteria

Gram Positive and Gram Negative Bacteria For Prokaryotic Cells Image

Both Gram-positive and Gram-negative bacteria possess cell wall peptidoglycans confer the characteristic cell shape and provide the cell with mechanical protection.

Teichoic acids are covalently linked to the peptidoglycan in some Gram-positive bacteria.

Most Gram-positive bacteria have a relatively thick, continuous cell wall, which is composed largely of peptidoglycan.

Both Gram-positive and Gram-negative bacteria take up the same amounts of crystal violet (CV) and iodine (I) which is trapped inside the Gram-positive cell by the dehydration and reduced porosity of the thick cell