20 Questions
What distinguishes Proteobacteria from other bacteria?
Outer membrane
Which type of Proteobacteria is associated with animal hosts within their intestinal tract?
Gamma-proteobacteria
What distinguishes MacConkey Medium from other growth media?
Acidifying triggers pH indicator
Which bacteria is commonly used as an indicator organism to assess water contamination?
Escherichia coli
'Heterocysts' are associated with which type of bacteria?
Cyanobacteria
What is the primary role of Rhizobia in symbiosis with legumes?
Fix nitrogen for the plant
'Nitrifiers' are particularly known for their ability to convert:
NH3- to NO2-
'Bacteroids' found in plant nodules fix nitrogen primarily by:
$N_2$ fixation
'Nitrogenase', the nitrogen-fixing enzyme complex, is primarily deactivated by:
$O_2$
'Denitrification' is a process that converts nitrite ($NO_2^-$) into:
$N_2$
What is the function of gas vesicles in cyanobacteria?
To help in vertical movement in the water column
What is the role of heterocysts in cyanobacteria?
To fix nitrogen
What distinguishes spirochetes in terms of cell structure?
Helical protoplasmic cylinder
How do spirochetes achieve locomotion?
By flagellar rotation to counter-rotate the protoplasmic cylinder
Where are Aquificae and Thermotogae bacteria commonly found?
Geothermal pools and smoldering coal-mine waste
What is the main difference between the photosynthetic systems based on chlorophyll (Chl) versus bacteriochlorophyll (BChl)?
The absorption spectra of the pigments
Which type of bacteria is characterized by utilizing H2S as a typical external electron donor in their photosynthetic process?
Green sulfur bacteria
What is the primary role of accessory pigments like carotenoids in photosynthetic bacteria?
Extending the absorption spectrum
In which photosynthetic bacteria group do you find the main chlorophyll being bacteriochlorophyll and the main accessory pigment as carotenoids?
Purple bacteria
What was a significant event approximately 2.6 billion years ago related to the evolution of photosynthesis?
Oxygen began to accumulate due to photosynthesis
Test your knowledge about the characteristics of Proteobacteria, including their gram-negative nature with an outer membrane, diverse metabolic capabilities, and major phylogenetic groups such as Alpha-, Beta-, and Gamma-proteobacteria. Learn about enteric bacteria and example organotrophic Gamma-proteobacteria.
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