Exam 13: Metabolic Diversity of Microorganisms

Explain why it is unlikely an iron-oxidizing bacterium would thrive in a cold stream with a neutral pH.Also propose an experiment that would test whether iron-oxidizing bacteria are present in the stream.

Heterofermentation CANNOT be differentiated from homofermentation based on the compound fermented.

Anaerobic fermentation often provides CO₂,which can be used by ________ as an electron acceptor for energy.

Organisms grown with CO₂ as its sole carbon source must have energy in the form of ATP as well as reducing power.

Two separate photosystems involved in electron flow is a hallmark of

Proteomic analysis of a microbial community indicated an abundance of phycobiliproteins.Which phototrophic group is likely active and abundant in this community?

Light energy passes from phycobiliproteins to reaction centers in

Illustrate the reaction center of a purple bacterium with the following features highlighted: antenna pigments,the special pair,protein H,protein L,protein M,quinone pool,and ATPase.Also explain the importance of proximity for these components within a reaction center.

Bacteria that degrade aromatic compounds with reductions steps rather than oxygenase activity prior to ring fission are likely to be anaerobes.

Compare and contrast the prokaryotic and eukaryotic light-gathering machinery function and spatial organization.Why do various chlorophylls show different absorption spectra?

When elemental sulfur is provided externally as an electron donor,the organism must attach itself to the sulfur particle because of the extreme insolubility of elemental sulfur.

What is the difference between chlorophyll and bacteriochlorophyll,and which organisms contain each?

A bacterium that catabolizes a compound by linking ion pumps to establish a proton or sodium motive force for energy

A cell that lacks sulfite oxidase but can still oxidize sulfur for energy could be identified by

In Bacteria,the MOST common oxidized form of nitrogen is ________ and of sulfur is ________.

What would likely occur if an anammox bacterium was unable to use ladderane lipids?

Some anaerobic bacteria not only use organic compounds as a carbon source but can also use them for energy as well.

What products would be expected to form during anoxic degradation of the seven-carbon compound benzoate following reduction and cleavage of the aromatic ring?

Whether an organism is classified as a photoheterotroph or a photoautotroph depends on its

Bacteriochlorophyll and chlorophyll contain ________ as a cofactor.