Energetics and redox

A large mostly hairless primate obtains its energy, electrons, and carbon primarily from caffeinated beverages and fried potato sticks. What type of metabolism does this organism display?

• chemolithoautotrophy

• photoorganoheterotrophy

• chemoorganoheterotrophy

• chemoorganoautotrpohy

Tags

NGSS.HS-LS1-7

A succulent clings to life on a kitchen counter, where it receives moderate amounts of sunlight for generating ATP, and is occasionally watered, which it uses to generate electrons. It uses atmospheric CO₂ as a carbon source, which it gets in ample supply. What type of metabolism is it displaying?

• photolithoautotrophy

• chemoorganoheterotrophy

• chemolithoautotrophy

• photoorganoheterotrophy

Tags

NGSS.HS-LS1-5

NGSS.HS-LS2-5

Nitrosomonas europaea is a Gram-negative bacterium that has been studied for its role in bioremediation. Nitrosomonas lives in environments with high levels of ammonia, which it uses to generate electrons and energy. It obtains carbon from CO₂ in the atmosphere. What type of metabolism is it demonstrating?

• photolithoautotrophy

• chemolithoautotrophy

• chemolithoheterotrophy

• chemoorganoheterotrophy

Tags

NGSS.HS-LS2-3

Zn + 2H⁺ → Zn²⁺ + H₂

• Zn is oxidized; H is reduced

• Zn is reduced; H is oxidized

• This is not a redox reaction

2Al + 3Cu³⁺ → 2Al³⁺ + 3Cu

• Al is oxidized; Cu is reduced

• Cu is oxidized; Al is reduced

• This is not a redox reaction

Tags

NGSS.HS-PS1-7

CO₃^2- + 2H⁺ → CO₂ + H₂O

• H is oxidized ; C is reduced

• H is reduced ; C is oxidized

• This is not a redox reaction

Given the following standard reduction potentials, how would you order these in an electron transport chain?

NADH = -0.32, FMN = -0.27, ubiquinone = 0.1

• NADH, ubiquinone, FMN

• ubiquinone, FMN, NADH

• FMN, ubiquinone, NADH

• NADH, FMN, ubiquinone

E. coli has multiple electron transport chains and can do both aerobic and anaerobic respiration. Its chain begins with an NADH dehydrogenase. Electrons are then transferred to ubiquinone. At which point it can be transferred to either the cytochrome bo or cytochrome bd branches. Cytochrome bd has a higher affinity for oxygen than bo, but is less efficient because it transfers fewer protons across the membrane. You begin growing a culture in fresh media with aeration. Which electron transport chain is likely to be active?

• aerobic respiration with cytochrome bo

• aerobic respiration with cytochrome bd

• anaerobic respiration

Tags

NGSS.HS-LS1-7

NGSS.HS-LS2-3

E. coli has multiple electron transport chains and can do both aerobic and anaerobic respiration. Its chain begins with an NADH dehydrogenase. Electrons are then transferred to ubiquinone. At which point it can be transferred to either the cytochrome bo or cytochrome bd branches. Cytochrome bd has a higher affinity for oxygen than bo, but is less efficient because it transfers fewer protons across the membrane. As your culture moves into lag phase, the amount of oxygen available in the culture decreases, which pathway would the bacteria be likely to use?

• aerobic respiration with cytochrome bo

• aerobic respiration with cytochrome bd

• anaerobic respiration

Tags

NGSS.HS-LS1-7

NGSS.HS-LS2-3