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Unit 4

MICRO EXAM 2

QuestionAnswer
Noncyclic photophosphorylation employs which photosystem(s)? Both photosystem I and photosystem II
What is the fate of electrons in noncyclic photophosphorylation? Reduce NADP+ to NADPH
What is the fate of the NADPH molecules created during noncyclic photophosphorylation? They are used in the Calvin-Benson cycle
What is the role of water in cyclic photophosphorylation? It provides electrons and protons.
Where do the electrons from photosystem I ultimately go after they are passed through the electron transport proteins? They return to photosystem I.
According to the animation, where would you find the lowest pH? In the thylakoid space
What drives the production of ATP in cyclic photophosphorylation? Proton gradient
Where does the energy to excite the electrons in photosystem I come from? Sunlight
Which of the following types of organisms uses hydrogen sulfide for reducing power? Purple sulfur bacteria
In which organism would you likely find a chlorosome? Green sulfur bacteria
Which of the following is a bacterium that performs oxygenic photosynthesis? Cyanobacteria
What is the key difference between photoheterotrophs and photoautotrophs? Photoheterotrophs use organic compounds as their carbon source; photoautotrophs use carbon dioxide as their carbon source
Which of the following is a trait unique to photosynthetic eukaryotes? The presence of chloroplasts
Two separate photosystems involved in electron flow is a hallmark of oxygenic phototrophs.
The only organisms that perform photosynthesis are ones that produce some form of chlorophyll or bacteriochlorophyll
The metabolic diversity of photosynthetic bacteria stems from different light-harvesting complexes, electron donors, and organic compounds they produce.
At some of the lowest light concentrations, ________ can still grow well due to their ________, which effectively harvest photons for energy green bacteria / chlorosomes
Which of the following is NOT a role of carotenoids? to produce singlet oxygen
What is the function of the Calvin cycle in purple bacteria? to incorporate inorganic carbon into an organic compound
Identifying carboxysomes in a bacterium suggests it will use the Calvin cycle to convert the concentrated CO2 into biomass.
Why would some organisms need a metabolic pathway similar to glycolysis, such as the Entner-Doudoroff pathway? to generate NADPH
The foul-smelling putrescine byproduct suggests activity of amino acid fermentation by clostridia.
Due to a chemical equilibrium, a syntrophic relationship can be disrupted if the product from the first partners metabolism is removed too quickly False
Diazotrophs maximize nitrogenase activity by producing specialized structures or fixing N2 at times when oxygen is absent to protect nitrogenase from oxygen.
Sulfide oxidizers are among the most ecologically diverse trophic groups because of the different strategies they employ to access sufficient amounts of sulfide and oxygen simultaneously. True
In symbiotic associations between sulfur chemolithotrophs and eukaryotes such as tube worms and giant clams, the bacterial symbiont provides ________ while the host provides ________. a carbon and energy source / stable sulfide and oxygen levels
What is the primary difference between dissimilative sulfur reducers and dissimilative sulfur oxidizers? Dissimilative sulfur oxidizers use sulfur compounds as an energy source, while dissimilative sulfur reducers use sulfur compounds as terminal electron acceptors.
Dissimilatory sulfide-oxidizers use a variety of unique ecological strategies in order to position themselves at interfaces where sulfide and oxygen meet
. Which of the examples below is the best example of anaerobic respiration? An organism uses an electron transport chain with sulfur as the terminal electron acceptor.
Created by: user-1993459
 



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