Genetics: From Genes to Genomes
Genetics: From Genes to Genomes
6th Edition
ISBN: 9781259700903
Author: Leland Hartwell Dr., Michael L. Goldberg Professor Dr., Janice Fischer, Leroy Hood Dr.
Publisher: McGraw-Hill Education
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Chapter 14, Problem 2P

The unicellular, rod-shaped bacterium E. coli is ˜2 μm long and 0.8 μm wide, and has a genome consisting of a single 4.6 Mb circular DNA molecule. The unicellular archaean Methanosarcina acetivorans is spherical

(coccus-shaped) with a diameter of 3 μm and has a 5.7 Mb circular genome. The unicellular eukaryote Saccharomyces cerevisiae is roughly spherical, with a diameter of 5–10 μm. It has a haploid genome of 12 Mb divided among 16 linear chromosomes. Given these descriptions, how could you determine whether a new, uncharacterized microorganism was a bacterium, an archaean, or a eukaryote?

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Gram staining is a common technique used to differentiate two large groups of bacteria based on their different cell wall constituents. The Gram stain procedure distinguishes between Gram positive and Gram negative groups by coloring these cells red or violet. Gram positive bacteria stain violet due to the presence of a thick layer of peptidoglycan in their cell walls, which retains the crystal violet these cells are stained with. Alternatively, Gram negative bacteria stain red, which is attributed to a thinner peptidoglycan wall, which does not retain the crystal violet during the decoloring process - s. epidermidis a gram-positve coccus - E. coli a gram-negative bacillus  - C. xerosis a gram-positive bacillus  How does each organism fulfill a specific niche based on the information provided above?
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Genetics: From Genes to Genomes

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