Lecture 17: Endosymbiotic theory, Eukaryotic Microbes

Question 1

Identify eukaryotic organelles and their bacterial origins, supported by the endosymbiotic theory/hypothesis

Answer 1

• Mitochondrion was bacterial cell that was efficient at using oxygen for energy use
• Chloroplast was bacterial cell that was capable of carrying out photosynthesis

Question 2

Describe the endosymbiotic theory and the evidence that supports it

Answer 2

Hypothesis (1):
Nucleus came first
Mitochondrion second
Chloroplast third
-NOT VERY SUPPORTED

Hypothesis (2):
Mitochondrion first
Nucleus second
Chloroplast third

Question 3

Compare and contrast Bacteria, Archaea, and Eukaryotes

• Metabolic processes
• Cellular structures

Answer 3

True membrane bound nucleus
Bacteria: No
Archaea: No
Eukaryotes: Yes

Chromosomes
Bacteria: Usually 1 circular chromosome
Archaea: One circular chromosome
Eukaryotes: More than 1, Chromosomes are linear

Organelles
Bacteria: No
Archaea: No
Eukaryotes: Yes