Which of the following sequences accurately describes the series of structures through which air passes through on the way into the mammalian lung?
A. pharynx ? larynx ? trachea ? bronchi ? bronchioles ? alveoli
B. larynx ? pharynx ? trachea ? bronchi ? bronchioles ? alveoli
C. pharynx ? trachea ? larynx ? bronchi ? bronchioles ?alveoli
D. bronchi ? bronchioles ? pharynx ? larynx ? trachea ? alveoli
E. alveoli ? bronchioles ? bronchi ? trachea ? larynx ? pharynx
A. pharynx ? larynx ? trachea ? bronchi ? bronchioles ? alveoli
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Chemotaxis is a process by which bacteria
A. respond metabolically to the presence of autoinducer molecules. B. avoid phagocytosis. C. move on solid surfaces by means of type IV fimbriae. D. move toward an attractant or away from a repellent.
Now that the human genome has been sequenced, we know that there are fewer than expected protein
coding genes (approximately 20,000). Yet, the total number of proteins produced in humans approaches 100,000. What accounts for this discrepancy in numbers?
a. We have not yet identified all of the open reading frames in the human genome. b. We have not yet fully sequenced the human genome. c. The various mechanisms of mRNA processing lead to more proteins being produced than the DNA directly encodes. d. Some proteins are converted into completely new proteins after translation. e. There has been a gross over-estimation of the number of proteins produced in humans.
Which fungicide will account for 15 percent of ozone thinning in future years unless its production is
stopped? a. amphotericin B b. nystatin c. methyl bromide d. dicarboximide e. ethylmercury bromide
Which of the following is produced by the light reactions of photosynthesis and consumed by the Calvin cycle?
A. water B. O2 C. NADPH D. sugar