Eukaryotic Origins

Review Questions

What event is thought to have contributed to the evolution of eukaryotes?

  1. global warming
  2. glaciation
  3. volcanic activity
  4. oxygenation of the atmosphere

Hint:

D

Which characteristic is shared by prokaryotes and eukaryotes?

  1. cytoskeleton
  2. nuclear envelope
  3. DNA-based genome
  4. mitochondria

Hint:

C

Mitochondria most likely evolved by _____________.

  1. a photosynthetic cyanobacterium
  2. cytoskeletal elements
  3. endosymbiosis
  4. membrane proliferation

Hint:

C

Which of these protists is believed to have evolved following a secondary endosymbiosis?

  1. green algae
  2. cyanobacteria
  3. red algae
  4. chlorarachniophytes

Hint:

D

In 2016, scientists published the genome of Monocercomonoides, and demonstrated that this organism has no detectable mitochondrial genes. However, its genome was arranged in linear chromosomes wrapped around histones which are contained within the nucleus. Monocercomonoides is therefore a(n) _________.

  1. Bacteria
  2. Archea
  3. Eukaryote
  4. Endosymbiont

Hint:

C

Which of the following observations about a bacterium would distinguish it from the last eukaryotic common ancestor?

  1. A double-stranded DNA genome
  2. Lack of a membrane-bound structure surrounding the genome
  3. Fatty acids in the lipid bilayer of the plasma membrane
  4. Enclosed by a cell wall

Hint:

B