11 Questions
Which conjugated molecule in murein provides important ligands for adherence and receptor sites for viruses or antibiotics?
Peptidoglycan
What is the main function of murein in the bacterial cell wall?
Provide cell shape and protect the cell
Why do Gram-positive bacteria retain crystal violet stain during the staining process?
Due to high content of peptidoglycan in their structure
What happens to Gram-negative bacteria during the staining process involving alcohol treatment?
They fail to retain stain and are washed out
Which component is responsible for the cross-linking in the structure of peptidoglycan?
Pentaglycine
What is the characteristic feature that distinguishes Gram-positive bacteria from Gram-negative bacteria?
High content of peptidoglycan in cell wall structure
Describe the main features of molluscs' body organization.
Triploblastic, bilaterally symmetrical, coelomates, and protostomes with organ system grade of body organization.
What are the three main parts of a mollusc's body and their functions?
Muscular foot (movement), visceral mass (internal organs), and mantle (secretes shell).
How do many molluscs feed, and what organ do they use for this purpose?
Many molluscs feed using a radula, a strap-like rasping organ, to scrape food.
Explain the reproduction strategies observed in molluscs.
Reproduction in molluscs is always sexual. Some species have separate sexes, while others are hermaphrodites. They all pass through a trochophore larvae stage.
Which molluscs have reduced or completely lost their shells during evolution?
Slugs, squids, and octopus have reduced or lost their shells during evolution.
Learn about the composition of the bacterial cell wall, specifically made up of murein which consists of lipoglycan and peptidoglycan. Understand the role of the cell wall in providing shape, protecting the cell, and serving as important ligands for adherence.
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