Chapter 13 Phototrophy and Autotrophy Quiz – Flashcards

T/F The conversion of light into chemical energy is called photoautotrophy.

Proteomic analysis of a microbial community indicated an abundance of phycobiliproteins. Which phototrophic group is likely active and abundant in this community? A. prochlorophytes B. eukaryotic phototrophs C. green bacteria D. cyanobacteria

At some of the lowest light concentrations, ________ can still grow well due to their ________, which effectively harvest photons for energy. A. purple bacteria / chlorosomes B. green bacteria / antenna pigments C. purple bacteria / antenna pigments D. green bacteria / chlorosomes

The process by which electrons from the quinone pool are forced against the thermodynamic gradient to reduce NAD+ to NADH is called reverse A. proton motive force. b. energy flow. c. reduction. d. electron transport.

Two separate photosystems involved in electron flow is a hallmark of A. purple bacteria. B. oxygenic phototrophs. C. anoxygenic phototrophs. D. green sulfur bacteria.

The path of electron flow in oxygenic phototrophs is referred to as the ________ scheme. A. S B. Z C. E D. Q

T/F Photosystem I is responsible for splitting a water molecule in the first step of oxygenic electron flow.

Noncyclic photophosphorylation employs which photosystem(s)? Photosystem I Photosystem II Both photosystem I and photosystem II Neither photosystem I nor photosystem II

What is the fate of electrons in noncyclic photophosphorylation? Reduce NADP+ to NADPH Reduce oxygen to water Oxidize NADP+ to NADPH Reduce oxygen to carbon dioxide Oxidize oxygen to water

What is the fate of the NADPH molecules created during noncyclic photophosphorylation? They bring electrons back to photosystem II. They are used to make ATP. They provide protons for the proton gradient. They are used in the Calvin-Benson cycle.

The Calvin cycle A. is responsible for the fixation of CO2 into cell material. B. uses CO2, NAD(P)H, and ATP to make biomass with ribulose bisphosphate carboxylase and phosphoribulokinase. C. requires both ribulose bisphosphate carboxylase and phosphoribulokinase. D. utilizes both NAD(P)H and ATP. E. all of the above are correct.

Regarding CO2 fixation mechanisms in the autotrophic green sulfur bacteria, A. both Chlorobium and Chloroflexus use the hydroxypropionate pathway. B. Chlorobium uses the hydroxypropionate pathway, and Chloroflexus uses the reverse citric acid cycle. C. both Chlorobium and Chloroflexus use the reverse citric acid cycle. D. Chlorobium uses the reverse citric acid cycle, and Chloroflexus uses the hydroxypropionate pathway.