Question

Imagine that you have discovered a prokaryote growing on some leftovers in your kitchen. You analyze the structure of its cell wall with an electron microscope and discover that the cell wall is very thick and has a meshlike structure. To which domain does the organism most likely belong? a) Bacteria b) Archea c) Eukarya

explain your answer. ;)

Answer 1

The Correct Ans is A Bacteria

The major component of the bacterial cell wall is peptidoglycan or murein. This rigid structure of peptidoglycan, specific only to prokaryotes, gives the cell shape and surrounds the cytoplasmic membrane. Peptidoglycan is a huge polymer of disaccharides (glycan) cross-linked by short chains of identical amino acids (peptides) monomers. In gram-positive bacteria the peptidoglycan forms a thick meshlike layer that retains the blue dye of the Gram stain  due the presence of peptidoglycan in their cell wall.

The Archaea have markedly different surface structures from the Bacteria. They do not have peptidoglycan; instead, their membrane lipids are made up of branched isoprenoids linked to glycerol by ether bonds.

Many kinds of prokaryotes and eukaryotes contain a structure outside the cell membrane called the cell wall. ... Among the eukaryotes, some protists, and all fungi and plants, have cell walls. Cell walls are not identical in these organisms, however. In fungi, the cell wall contains a polysaccharide called chitin