Given that the enzymes that catalyze nitrogen fixation are inhibited by oxygen, what are two "strategies" that nitrogen-fixing prokaryotes might use to protect these enzymes from oxygen?
1. Couple them with photosystem II (the photosystem that splits water molecules).
2. Package them in membranes that are impermeable to all gases.
3. Be obligate anaerobes.
4. Be strict aerobes.
5. Package these enzymes in specialized cells or compartments that inhibit oxygen entry.
A) 1 and 4
B) 2 and 4
C) 3 and 4
D) 3 and 5
D
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Which of the following is the best definition of fermentation?
A) the partial reduction of glucose to pyruvic acid B) the partial oxidation of glucose with organic molecules serving as electron acceptors C) the complete catabolism of glucose to CO2 and H2O D) the production of energy by oxidative-level phosphorylation E) the production of energy by both substrate and oxidative phosphorylation
Explain the nature and function of an enrichment culture
What will be an ideal response?
A unique feature of the diaphragm is that it is_____
a. the only smooth muscle in the human body b. the only smooth muscle that can be voluntarily controlled c. only found in humans d. the only skeletal muscle that is under involuntary control e. easily replaceable
Which of the following diseases is NOT caused by a Rickettsia species?
a. human monocytic ehrlichiosis b. Rocky Mountain spotted fever c. typhus d. Q fever