Cell Structure and Function

• do centrioles have a membrane?

  no
• does chromatin have a membrane?

  no
• does the golgi have a membrane?

  yes
• do intermediate filaments have membranes?

  yes
• do lysosomes have membranes?

  yes
• do microfilaments have membranes?

  no
• do microtubules have membranes?

  no
• do mitochondria have membranes?

  yes
• does the smooth ER have a membrane?

  yes
• does the rough ER have a membrane?


  yes
• do ribosomes have membranes?

  no
• does the plasma membrane have a membrane?

  yes
• do peroxisomes have membranes?

  yes
• does the nucleus have a membrane?

  yes
• does the nuclear envelope have a membrane?

  yes
• does the nucleolus have a membrane?

  no
• eukaryotic DNA is linear
• prokaryotic DNA is circular
• prokaryotes lack a true nucleus and other membranous structures
• prokaryotes have small ribosomes
• prokaryotes have peptidoglycan cell walls
• prokaryotic flagella

  • do not have a 9+2 structure
  • not made of microtubules
• eukaryotic flagella

  • have a 9+2 structure
  • made of microtubules
• eukaryotes have cellulose cell walls
• eukaryotes have large ribosomes
• eukaryotes have a true nucleus and other membranous structures
• prokaryotic domains: bacteria and archaea
• eukaryotic domain: eukarya
• prokaryotic kingdoms: eubacteria and archaebacteria
• eukaryotic kingdoms: fungi, animals, plants, and protists
• 1600s: Hooke and Leeuwenhoek
• Hooke observed cells in cork
• Leeuwenhoek created the first powerful microscope
• 1800s: Brown, Scheiden, Schwann, and Virchow
• Brown discovered the nucleus
• Schleiden was a botanist that concluded that all plants are made of cells
• Schwann was a zoologist that discovered all animals are made of cells
• Virchow concluded that all cells come from / are created by other cells
• Cell Theory

  1. All living things are composed of one or more cells
  2. Cells are the basic units of structure and function in an organism
  3. Cells come only from existing cells
• true nucleus

  has a membrane