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Chemotroph: Quiz


Question 1: It is accepted that some mechanism exists which eats away at the rock, perhaps through specialized ________ or compounds which bring more FeO to the surface.
Cofactor (biochemistry)ProteinEnzymeEnzyme inhibitor

Question 2: Most are bacteria or ________ that live in hostile environments such as deep sea vents and are the primary producers in such ecosystems.

Question 3: Lava beds supply bacteria with iron straight from the Earth's mantle, but only newly formed ________ rocks have high enough levels of unoxidized iron.
FelsicBasaltIgneous rockGranite

Question 4: Evolutionary scientists believe that the first organisms to inhabit Earth were chemoautotrophs that produced oxygen as a by-product and later evolved into both aerobic, animal-like organisms and ________, plant-like organisms.
Plant physiologyCell wallAlgaePhotosynthesis

Question 5: Most of the ocean is devoid of iron, due to both the oxidative effect of dissolved oxygen in the water and the tendency of ________ to uptake the iron.
ProkaryoteCyanobacteriaBacteriaGram-positive bacteria

Question 6: Chemoautotrophs (or chemotrophic autotroph), (Gk: Chemo = chemical, auto = self, troph = nourishment) in addition to deriving energy from chemical reactions, synthesize all necessary organic compounds from ________.
Carbon cycleCarbon dioxideCarbon sinkGreenhouse gas

Question 7: Chemoautotrophs generally fall into several groups: methanogens, ________, sulfur reducers, nitrifiers, anammoxbacteria and thermoacidophiles.
EndolithArchaeaAcidophile (organisms)Halophile

Question 8: Most chemoheterotrophs derive energy from organic molecules like ________.

Question 9: ________ oxidizing bacteria also make use of igneous lava rocks in much the same way - by oxidizing Mn2+ into Mn4+.

Question 10: Chemotrophs are organisms that obtain energy by the oxidation of ________ donating molecules in their environments.


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