Why does the citric acid cycle only operate in the presence of oxygen?
A) Oxygen must combine with carbon to form carbon dioxide.
B) Oxygen allows the electron transport chain to receive electrons from NADH and FADH2, and recycle NAD+ and FAD back to the citric acid cycle.
C) Oxygen accepts the ATP from glycolysis so that it can be recycled.
D) Oxygen is added in the form of water to the citric acid cycle.
E) Oxygen allows the electron transport chain to receive electrons from NAD+ and FAD, and recycle NADH and FADH2 back to the citric acid cycle.
B) Oxygen allows the electron transport chain to receive electrons from NADH and FADH2, and recycle NAD+ and FAD back to the citric acid cycle.
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In symbiotic associations between sulfur chemolithotrophs and eukaryotes such as tube worms and giant clams, the bacterial symbiont provides ________ while the host provides ________
A) nitrogen / carbon and oxygen B) sulfide / oxygen C) a carbon and energy source / stable sulfide and oxygen levels D) organic acids / stable sulfate levels
An appendix infection is known as what?
A) gastritis B) appendectomy C) peritonitis D) appendicitis
Which ion accumulates in the outer mitochondrial membrane compartment during electron transport chain reactions?
calciumcalcium a. hydrogen b. oxygen c. sodium d. potassium e. calcium
Which of the following enzymes are important in the deactivation of cAMP and termination of signaling?
A) phosphodiesterase B) protein kinase C) adenylate cyclase D) G protein