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BIOL 3340 . Chapter 3. Chapter 4 . Microbial Cell Structure Eucaryotes. Eucaryotic Cell Structure. membrane-delimited nuclei membrane-bound organelles that perform specific functions more structurally complex than procaryotic cell generally larger than procaryotic cell.

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biol 3340

BIOL 3340

Chapter 3

chapter 4
Chapter 4

Microbial Cell Structure


eucaryotic cell structure
Eucaryotic Cell Structure
  • membrane-delimited nuclei
  • membrane-bound organelles that perform specific functions
  • more structurally complex than procaryotic cell
  • generally larger than procaryotic cell
eucaryotic membranes
Eucaryotic Membranes
  • Includes: animal & plant cells, fungi & protists (protozoa & algae).
  • Have a true nucleus with DNA
  • DNA is enclosed in a membrane-bound nucleus
  • membrane-enclosed cell organelles
eucaryotic membranes8
…Eucaryotic Membranes
  • the fluid mosaic model is based on eucaryotic membranes
  • They are enriched with lipids and proteins
  • They participate in a variety of cell processes such as cell movement and transduction
  • Many organelles of eucaryotic cells lie in the cytoplasmic matrix
  • The cytoplasmic matrix -vast network of interconnected filaments.
  • Filaments that form the cytoskeleton: microfilaments, microtubules, and intermediate filaments.
  • plays role in both cell shape and cell movement
cytoplasmic matrix
..Cytoplasmic Matrix
  • Viscous aqueous suspension of proteins, nucleic acid, dissolved organic compounds, mineral salts
  • Network of protein fibers similar to the eukaryotic cytoskeleton.

Cytoplasmic Inclusion Bodies:

  • granules of organic or inorganic material that are stockpiled by the cell for future use.
  • some are enclosed by a single-layered membrane
  • minute protein filaments, 4 to 7 nm in diameter
  • scattered within cytoplasmic matrix or organized into networks and parallel arrays
  • composed of actin protein
  • involved in cell motion and shape changes
  • shaped like thin cylinders ~ 25 nm in diameter
  • composed of a- and b-tubulin
  • help maintain cell shape
  • involved with microfilaments in cell movements
  • participate in intracellular transport processes
the endoplasmic reticulum
…The Endoplasmic Reticulum
  • irregular network of branching and fusing membranous tubules and flattened sacs (cisternae – s.,cisterna).
  • rough ER
    • ribosomes attached
    • synthesis of secreted proteins by ER-associated ribosomes
  • smooth ER
    • devoid of ribosomes
    • synthesis of lipids by ER-associated enzymes
the endoplasmic reticulum18
…The Endoplasmic Reticulum
  • The ribosomes -sites of synthesis of some proteins that it transports
  • transports proteins, lipids, and other materials within cell.
  • Ribosomes in the eukaryotic cytoplasm are larger than prokaryotic ribosomes
  • Ribosomes are also found within mitochondria and chloroplasts; the ribosomes of these organelles are very similar in structure & size to prokaryotic ribosomes
  • site where ATP is generated by electron transport and oxidative phosphorylation
  • site of photosynthetic reactions


  • membrane-bound structure that houses genetic material of eucaryotic cell


  • dense fibrous material within nucleus
  • contains DNA
  • condenses to form chromosomes during cell division

Nuclear envelope:

    • double membrane structure that delimits nucleus
    • penetrated by nuclear pores
      • pores allow materials to be transported into or out of nucleus


  • important in ribosome synthesis
other cell inclusions
Other cell inclusions
  • Golgi bodies-involved in modification, packaging, and secretion of materials
  • Lysosomes- membrane-bound vesicles found in most eucaryotes
  • involved in intracellular digestion
  • Vacuoles-transport system


  • asexual reproduction
    • transverse fission
    • budding
    • spore production
  • sexual reproduction
    • involves union of compatible nuclei followed by formation of sexual spores
  • Lecture PowerPoints Prescott’s Principles of Microbiology-Mc Graw Hill Co.