Question

1. Which of the following structures makes cyanobacteria optimal symbionts for eukaryotic organisms needing oxygen and nutrients?

A. chloroplasts

B. plasmids

C. thylakoids

D. capsules

2. Which of the following “environments” could provide the BEST chance of survival via symbiosis to a photoautotroph bacterial species?

A. the intestine of a cow

B. the eye of a flashlight fish living in the deep ocean

C. a colony of fungi near a pond

D. the interior of an ant’s nest

3. Which of the following is a feature entirely shared by the domains of bacteria and archaea, indicating their common prokaryotic origin?

A. living in colonies

B. autotrophy

C. circular chromosomes

D. being extremophiles

Answer 1

1.B. Plasmid makes cyanobacteria optimal symbionts for eukaryotic organisms needing oxygen and nutrients.

2.C. A colony of fungi near pond “environments” could provide the BEST chance of survival via symbiosis to a photoautotroph bacterial species.

3.C.Circular Chromosome is a feature entirely shared by the domains of bacteria and archaea, indicating their common prokaryotic origin.