Cells
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Cells

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  • Figure 6.5 A prokaryotic cell.
  • Figure 6.5 A prokaryotic cell.
  • Figure 6.8 Exploring: Eukaryotic Cells
  • Figure 6.8 Exploring: Eukaryotic Cells

Cells Cells Presentation Transcript

  • Concept : Eukaryotic cells have internalmembranes that compartmentalize their functions • The basic structural and functional unit of every organism is one of two types of cells: prokaryotic or eukaryotic • Only organisms of the domains Bacteria and Archaea consist of prokaryotic cells • Protists, fungi, animals, and plants all consist of eukaryotic cells
  • Comparing Prokaryotic and Eukaryotic Cells• Basic features of all cells – Plasma membrane – Semifluid substance called cytosol – Chromosomes (carry genes) – Ribosomes (make proteins)
  • • Prokaryotic cells are characterized by having – No nucleus – DNA in an unbound region called the nucleoid – No membrane-bound organelles – Cytoplasm bound by the plasma membrane
  • Figure 6.5 Fimbriae Nucleoid Ribosomes Plasma membraneBacterialchromosome Cell wall Capsule 0.5 µm(a) A typical Flagella (b) A thin section rod-shaped through the bacterium bacterium Bacillus coagulans (TEM)
  • Figure 6.5a 0.5 µm (b) A thin section through the bacterium Bacillus coagulans (TEM)
  • • Eukaryotic cells are characterized by having – DNA in a nucleus that is bounded by a membranous nuclear envelope – Membrane-bound organelles – Cytoplasm in the region between the plasma membrane and nucleus• Eukaryotic cells are generally much larger than prokaryotic cells
  • Figure 6.8a ENDOPLASMIC RETICULUM (ER) Nuclear Rough Smooth envelope Flagellum ER ER NUCLEUS Nucleolus Chromatin Centrosome Plasma membrane CYTOSKELETON: MicrofilamentsIntermediate filaments Microtubules Ribosomes Microvilli Golgi apparatus Peroxisome Mitochondrion Lysosome
  • Figure 6.8c Nuclear Rough envelope endoplasmicNUCLEUS reticulum Smooth Nucleolus endoplasmic reticulum Chromatin Ribosomes Central vacuole Golgi apparatus Microfilaments Intermediate CYTOSKELETON filaments Microtubules Mitochondrion PeroxisomePlasma membrane Chloroplast Cell wall Plasmodesmata Wall of adjacent cell
  • A Panoramic View of the Eukaryotic Cell • A eukaryotic cell has internal membranes that partition the cell into organelles • Plant and animal cells have most of the same organelles
  • BioFlix: Tour of an Animal Cell
  • BioFlix: Tour of a Plant Cell