Bacterial Cell Wall Composition

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Questions and Answers

Which conjugated molecule in murein provides important ligands for adherence and receptor sites for viruses or antibiotics?

  • Lipoglycan
  • N-Acetylglucosamine
  • Peptidoglycan (correct)
  • Pentaglycine

What is the main function of murein in the bacterial cell wall?

  • Generate energy for the cell
  • Provide cell shape and protect the cell (correct)
  • Facilitate communication between cells
  • Regulate cell division

Why do Gram-positive bacteria retain crystal violet stain during the staining process?

  • Lack of peptidoglycan in their structure
  • Due to high content of peptidoglycan in their structure (correct)
  • Due to outer lipopolysaccharide content
  • Presence of lipoglycan in their cell walls

What happens to Gram-negative bacteria during the staining process involving alcohol treatment?

<p>They fail to retain stain and are washed out (D)</p> Signup and view all the answers

Which component is responsible for the cross-linking in the structure of peptidoglycan?

<p>Pentaglycine (A)</p> Signup and view all the answers

What is the characteristic feature that distinguishes Gram-positive bacteria from Gram-negative bacteria?

<p>High content of peptidoglycan in cell wall structure (A)</p> Signup and view all the answers

Describe the main features of molluscs' body organization.

<p>Triploblastic, bilaterally symmetrical, coelomates, and protostomes with organ system grade of body organization.</p> Signup and view all the answers

What are the three main parts of a mollusc's body and their functions?

<p>Muscular foot (movement), visceral mass (internal organs), and mantle (secretes shell).</p> Signup and view all the answers

How do many molluscs feed, and what organ do they use for this purpose?

<p>Many molluscs feed using a radula, a strap-like rasping organ, to scrape food.</p> Signup and view all the answers

Explain the reproduction strategies observed in molluscs.

<p>Reproduction in molluscs is always sexual. Some species have separate sexes, while others are hermaphrodites. They all pass through a trochophore larvae stage.</p> Signup and view all the answers

Which molluscs have reduced or completely lost their shells during evolution?

<p>Slugs, squids, and octopus have reduced or lost their shells during evolution.</p> Signup and view all the answers

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