BackWhat do some photosynthetic bacteria use as a source of electrons instead of water?
a. Oxygen (O2)
b. Hydrogen sulfide (H2S)
c. Organic compounds (e.g., CH3COO−)
d. Nitrate (NO3-)
Photoautotrophs use
a. Light as an energy source and CO₂ as a carbon source
b. Light as an energy source and methane as a carbon source
c. N₂ as an energy source and CO₂ as a carbon source
d. CO₂ as both an energy source and a carbon source
What are organisms called that use inorganic compounds as electron donors in cellular respiration?
a. Phototrophs
b. Heterotrophs
c. Organotrophs
d. Lithotrophs
What does the chemiosmotic hypothesis claim?
a. ATP is generated using phosphates taken from intermediates in the electron transport chain.
b. ATP is generated using a phosphate gradient produced by glycolysis and the citric acid cycle.
c. ATP is generated using a proton-motive force that is produced by the electron transport chain.
d. Water is generated using electrons taken from NADH and FADH2 and transported through the electron transport chain.
Which of the following statements is true?
a. Archaea and bacteria have identical membrane lipids.
b. The cell walls of archaea lack peptidoglycan.
c. Prokaryotes have low levels of genetic diversity.
d. No archaea are capable of using CO₂ to oxidize H₂, releasing methane.