Introduction to Domain Archaea and Microbial Classification
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Introduction to Domain Archaea and Microbial Classification

Learn about the Domain Archaea and microorganism classification through a comparison of human, Escherichia coli, and Staphylococcus aureus. Understand the differences in kingdom, phylum, and class among these organisms.

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Questions and Answers

Which molecule is the Three-Domain System of Classification based on?

rRNA

What is the correct sequence in the classification hierarchy?

Kingdom, Division, Order, Class, Family, Genus

Which structure is never found in procaryotic cells?

cilia

Which structure controls the transport of materials between the cell and its external environment?

<p>cell membrane</p> Signup and view all the answers

In eucaryotic cells, what are the sites of photosynthesis?

<p>plastids</p> Signup and view all the answers

What is the major difference in the composition of the cell walls between Gram-positive and Gram-negative bacteria?

<p>Gram-positive bacteria have a thick layer of peptidoglycan combined with teichoic acid, while Gram-negative bacteria have a thinner layer of peptidoglycan covered with a complex layer of lipid macromolecules.</p> Signup and view all the answers

Which bacteria possess cell walls that do not contain peptidoglycan?

<p>Bacteria in the genus Mycoplasma</p> Signup and view all the answers

What is the function of cytoplasmic granules in bacteria?

<p>Storage of reserve materials</p> Signup and view all the answers

What is the main difference between Gram-negative and Gram-positive bacterial cell walls?

<p>Gram-negative cell walls have an outer membrane, while Gram-positive cell walls contain a thick peptidoglycan layer.</p> Signup and view all the answers

Which component of bacterial cells is crucial for resisting mechanical breakage and osmotic lysis?

<p>Peptidoglycan layer</p> Signup and view all the answers

Where are ribosomes typically found in procaryotic cells?

<p>In the cytoplasmic granules</p> Signup and view all the answers

What is the composition of a 70S procaryotic ribosome?

<p>30S and 50S subunits</p> Signup and view all the answers

How are cytoplasmic granules in bacteria identified microscopically?

<p>By staining with a suitable stain</p> Signup and view all the answers

Which type of cell wall contains teichoic acids according to the text?

<p>Gram-positive cell wall</p> Signup and view all the answers

What is the main constituent of most bacterial cell walls according to the text?

<p>Peptidoglycan</p> Signup and view all the answers

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