Ventilation includes
A. inspiration only.
B. both inspiration and expiration.
C. expiration only.
D. the volume of air that can be exhaled.
E. the transportation of oxygen to cells in the body.
Answer: B
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Two tubes are inoculated from one test tube of a bacterial culture. The cultures are then transferred every day for 2 months. All of the media and growth conditions are the same in every tube
After 2 months of cultivation, the fitness and genotype frequencies of the populations in the two tubes are compared. The fitness of the two cultures is the same, but the genotype frequencies are very different in the two cultures. How is this possible? A) Two months is not long enough for different fitness levels to evolve even if the genotype frequencies change. B) This result is not possible because different genotype frequencies would result in different fitness levels under the same growth conditions. C) Natural selection caused the evolution of different genotype frequencies within the separate test tubes. D) Genetic drift within the small populations in the test tubes resulted in different genotype frequencies.
The organisms that cause pneumococcal pneumonia are rarely found as a part of the normal flora of healthy adults
Indicate whether the statement is true or false.
Which of the following are most susceptible to complement lysis?
A. Gram-positive bacteria B. Gram-negative bacteria C. Bacteriophages D. Prions
The nervous system is capable of using some neurotransmitters for more than one function. For example, some neurotransmitters may be excitatory in one pathway yet inhibitory in another
Discuss what accounts for the same neurotransmitter having different functions in alternate pathways.