Scelta multipla
Which of the following best explains why multiple bacterial species can have similar staining reactions and microscopic morphology?
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1. Introduction to Microbiology
Members of the Bacterial World
Scelta multipla
Which of the following characteristics is used to classify an organism in the domain Bacteria?
A
80S ribosomes
B
Presence of peptidoglycan in the cell wall
C
Membrane-bound nucleus
D
Linear chromosomes
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Understand that the domain Bacteria is one of the three domains of life, characterized by specific cellular features.
Recall that Bacteria are prokaryotes, meaning they lack a membrane-bound nucleus and membrane-bound organelles, so characteristics like 'membrane-bound nucleus' and '80S ribosomes' (which are typical of eukaryotes) do not apply.
Recognize that bacterial cells have circular chromosomes, not linear chromosomes, which are typical of eukaryotic cells.
Focus on the cell wall composition: Bacteria have cell walls containing peptidoglycan, a polymer unique to this domain, which is a key distinguishing feature.
Conclude that the presence of peptidoglycan in the cell wall is the characteristic used to classify an organism in the domain Bacteria.
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