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  • Prokaryote structure (article) | Khan Academy
    The cell wall All prokaryotic cells have a stiff cell wall, located underneath the capsule (if there is one) This structure maintains the cell’s shape, protects the cell interior, and prevents the cell from bursting when it takes up water The cell wall of most bacteria contains peptidoglycan, a polymer of linked sugars and polypeptides
  • Bacterial characteristics - Gram staining (video) | Khan Academy
    Discover the fascinating world of bacteria! Learn how scientists differentiate bacteria by their shape - cocci, bacilli, and spirilla - and color using the Gram stain method Learn about similarities and differences in the structure of bacterial cell walls and understand why Gram positive bacteria retain the purple stain while Gram negative bacteria turn pink
  • Prokaryotic cells (article) | Cell biology | Khan Academy
    Most bacteria are, however, surrounded by a rigid cell wall made out of peptidoglycan, a polymer composed of linked carbohydrates and small proteins The cell wall provides an extra layer of protection, helps the cell maintain its shape, and prevents dehydration Many bacteria also have an outermost layer of carbohydrates called the capsule
  • Bacterial binary fission | The cell cycle and mitosis (article) | Khan . . .
    Bacterial binary fission is the process that bacteria use to carry out cell division Learn the steps of binary fission, including copying the bacterial chromosome and forming a new cell wall
  • Plant cell walls (video) | Khan Academy
    The cell wall surrounds the plant cell, providing both structure and protection Plant cell walls are made up mostly of cellulose, and also include hemicellulose and pectin Plant cells connect directly to one another via tunnels in their cell walls called plasmodesmata
  • Antibiotics: An overview (article) | Khan Academy
    Deactivating a bacterial enzyme (transpeptidase) that builds and repairs the bacteria wall Activating a bacterial enzyme (autolysin) that cuts open parts of the bacterial wall, an enzyme normally only activated when the bacteria is multiplying
  • Bacteriophages (article) | Viruses | Khan Academy
    Explore the biology of bacteriophages, their structure, life cycle, and role in science with Khan Academy's detailed educational resources
  • Bacteriophages (article) | Viruses | Khan Academy
    Cell bursting, or lysis, releases hundreds of new phages, which can find and infect other host cells nearby In this way, a few cycles of lytic infection can let the phage spread like wildfire through a bacterial population
  • Prokaryotic and eukaryotic cells (article) | Khan Academy
    Learn about the similarities and differences between prokaryotic and eukaryotic cells





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