Oxygen is NOT necessary for
A. anaerobic cellular respiration.
B. aerobic cellular respiration.
C. electron transport system.
D. All require oxygen.
A. anaerobic cellular respiration.
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Why is there free oxygen in the air?
A. Organisms need oxygen to manufacture ATP. B. Free oxygen has been present since the formation of the earth's atmosphere. C. Evaporation of the oceans liberated oxygen. D. It is a by-product of photosynthesis. E. Free oxygen has seeped from cracks in the earth's crust.
Would ID50 and LD50 necessarily be the same for a given virus? Why or why not?
A. Yes, because the number of viruses that infect 50% of a test population should also kill 50% of that test population. B. No, because a virus may be highly infectious (very low ID50 value) but only marginally lethal (very high LD50 value). A prime example of this is the rhinovirus (common cold virus). C. No, because very few viruses are lethal, yet many are highly infectious. The two values should ALWAYS be different. D. Yes, because what we're actually describing here is infection/killing of individual CELLS, not of entire organisms. If a cell is infected, it will always be killed.
Electrophoresis separates DNA fragments on the basis of ____
a. molecular charge b. molecular bonding c. molecular size d. polarity e. nonpolarity
Which of the following will increase the unloading of oxygen within the tissue?
A) increased hydrogen ion concentration only B) increased PCO2 only C) increased body temperature only D) both increased hydrogen ion concentration and increased body temperature E) increased hydrogen ion concentration, increased body temperature, and increased PCO2