[Campbell Biology P.642] The diversity of protists is largely attributed to endosymbiosis. A... | Practice Question

The diversity of protists is largely attributed to endosymbiosis. According to the diagram provided, which two key organelles are believed to have originated from endosymbiotic events within early eukaryotic cells?

  • A: Nucleus and Ribosomes
  • B: Mitochondria and Plastids
  • C: Endoplasmic Reticulum and Golgi Apparatus
  • D: Cell Wall and Vacuoles

Explanation

The diagram clearly shows that an 'Engulfed aerobic bacterium' led to the 'Mitochondrion' in an 'Early eukaryote a heterotroph ', and later, an 'Engulfed photosynthetic bacterium' led to the 'Plastid' in an 'Early photosynthetic eukaryote'. These two events represent the primary endosymbiosis leading to mitochondria and plastids.