Eukaryotic vs Prokaryotic Cells and Organelles Summary

  • Introduction to Cell Types

  • Focus on eukaryotic cells as a continuation from prokaryotic cells

  • Key similarities and differences between prokaryotic and eukaryotic cells

  • Comparison of Cell Size

  • Eukaryotic cells are generally larger than prokaryotic cells

  • Prokaryotic cells size is in nanometers; eukaryotic cells in micrometers

  • Visualization in figures shows scale differences clearly

  • Presence of Organelles

  • Organelles are vital for eukaryotic cells

  • Presence of a nucleus as a defining feature of eukaryotic cells

  • If organelles are present, cell is eukaryotic; absence indicates prokaryotic

  • DNA Structure

  • Prokaryotes: circular DNA molecules

  • Eukaryotes: linear DNA molecules, varying in number

  • Differences observed biochemically, not through microscopy

  • Cell Membrane Structure

  • Both cell types have a cell membrane: lipid bilayer composed of phospholipids

  • Hydrophilic heads and hydrophobic tails structure creates a barrier

  • Functionality: regulates what enters and exits the cell

  • Embedded Molecules in Membranes

  • Various molecules embedded in or attached to the membrane perform different functions

  • Movement of embedded structures is limited but possible, likened to 'not quite set jello'

  • Types of Eukaryotic Cells

  • Focus primarily on animal and plant cells (fungal cells have unique conditions)

  • Both animal and plant cells share a set of organelles

  • Additional structures differ, especially in metabolic functions

  • Unique Organelles in Animal Cells

  • Example: centrosome found in animal cells

  • Function is still under study; not crucial for cell division

  • Plant and fungal cells manage division without centrosomes

  • Features of Plant Cells

  • Unique characteristics of plant cells include:

    • Cell Wall: Provides structure and protection
    • Chloroplasts: Sites of photosynthesis (not present in animal cells)
    • Central Vacuole: Large storage area for water, pigments, and starches

  • Changes in water levels in the vacuole can affect plant cell turgor and structure

  • Conclusion Regarding Storage Cells

  • Potato cells as an example of storage cells, storing starch in vacuoles for energy

  • Importance of distinguishing between similar terms (e.g., vacuoles) in different contexts