Concept explainers
Compare, Hypothesize, Invent
1. Archaea with cell walls consisting of a thick, homogeneous layer of complex polysaccharides often retain crystal violet dye when stained using the
Archaea and bacteria are referred to as prokaryotic unicellular organisms. Both organisms lacks membrane-bound organelles and nucleus. The plasma membranes of archaea are made up of strikingly different lipids compared to those present in the plasma membranes of bacteria. The bacterial plasma membrane is comprised of ester-linked phospholipids like hapanoids and sterols, whereas the archaeal plasma membrane is comprised of diether glycerol or tetraether glycerol.
Explanation of Solution
The cell wall of archaea is made up of complex polysaccharides and proteins but lacks a peptidoglycan. In certain members of archaea, the slime layer (S-layer) is act as the outermost layer, which is separated from the plasma membrane through a peptidoglycan-like molecule known as pseudomurein. The pseudomurein is also known as pseudopeptidoglycan.
During, Gram-staining procedures, the archaea cell wall retains the crystal violet dye. This is because, in Gram-positive bacteria, it is believed that the crystal violet-iodine complex is trapped in the peptidoglycan layer. Logically, a thick layer of complex polysaccharides in archaea that is closely resembles a peptidoglycan layer would trap the crystal violet-iodine complex too.
Want to see more full solutions like this?
Chapter 4 Solutions
Prescott's Microbiology
- MICROBE PROFILING Instructions: Choose any microorganism from the different groups of cellular and acellular and fill in the information required for your chosen microbe for profiling. 1. Scientific Name and common name of the microbe: 2. Importance: 3. Cellular or Acellular? 4. If cellular, eukaryote or Prokaryote? 5. If cellular, which Kingdom? 6. General Morphology (describe cell types, parts of cells, size, etc.): 7. Where are they commonly found? 8. Source of nutrition: 10. Does it cause human infection? (Yes or No); What disease? 11. If they cause diseases, how can we prevent the infection? 12. Representative photo 13. References:arrow_forwardGive typing answer with explanation and conclusion The antibiotic bacitracin binds to bactoprenol after it inserts a peptidoglycan monomer into a bacterial cell wall. Explain why this would lead to the death of the bacterium. 2. Penicillin antibiotics bind the bacterial enzyme transpeptidase. Explain why this would lead to the death of the bacterium. 3. Could either of the above antibiotics be used to treat protozoan infections such as giardiasis & toxoplasmosis? Why/Why notarrow_forwardPlease answer asaparrow_forward
- Provide link for references 1. Provide an illustration and brief description of the pathway of light in relation tomagnification on a compound microscope.arrow_forwardjust answer question --- dont need explanationarrow_forwardMention schematically stages of the life cycle of Plasmodium. (If possible please refer to NCERT.)arrow_forward
- Human Anatomy & Physiology (11th Edition)BiologyISBN:9780134580999Author:Elaine N. Marieb, Katja N. HoehnPublisher:PEARSONBiology 2eBiologyISBN:9781947172517Author:Matthew Douglas, Jung Choi, Mary Ann ClarkPublisher:OpenStaxAnatomy & PhysiologyBiologyISBN:9781259398629Author:McKinley, Michael P., O'loughlin, Valerie Dean, Bidle, Theresa StouterPublisher:Mcgraw Hill Education,
- Molecular Biology of the Cell (Sixth Edition)BiologyISBN:9780815344322Author:Bruce Alberts, Alexander D. Johnson, Julian Lewis, David Morgan, Martin Raff, Keith Roberts, Peter WalterPublisher:W. W. Norton & CompanyLaboratory Manual For Human Anatomy & PhysiologyBiologyISBN:9781260159363Author:Martin, Terry R., Prentice-craver, CynthiaPublisher:McGraw-Hill Publishing Co.Inquiry Into Life (16th Edition)BiologyISBN:9781260231700Author:Sylvia S. Mader, Michael WindelspechtPublisher:McGraw Hill Education