An aviator is flying at 30,000 ft where the barometric pressure is 226 mm Hg. He is breathing 100% oxygen, his alveolar PCO2 is 40 mm Hg, and his alveolar water vapor pressure is 47 mm Hg. What is the alveolar PO2 of the aviator (in mm Hg)? (Assume that the respiratory quotient is equal to 1.)

#Question id: 426

#SCPH05 I Biotechnology

Which statement is not true about catabolic pathways?

#Question id: 947

#SCPH28 | Zoology

 Which is not part of the synthesis reactions for histidine?

#Question id: 11075

#I Life Science/ Life Sciences Group – I-V

A 65-year-old man with emphysema due to 34 years of cigarette smoking is admitted to hospital due to dyspnea. With further tests the mean pulmonary arterial pressure is determined to be 45 mm Hg at rest. He is hypoxic (PO2 = 49 mm Hg), hypercapnic (85 mm Hg), and slightly acidotic. The cardiovascular and oxygen changes are due to which of the following?

#Question id: 3265

#SCPH06 I Botany

If the curve shifts to the left or to the right, there is no gene flow, and the population size consequently increases over successive generations, then which of these is (are) probably occurring?

#Question id: 9213

#SCPH28 | Zoology

Suppose you attend a town meeting at which some experts tell the audience that they have performed a cost-benefit analysis of a proposed transit system that would probably reduce overall air pollution and fossil fuel consumption. The analysis, however, reveals that ticket prices will not cover the cost of operating the system when fuel, wages, and equipment are taken into account. As a biologist, you know that if ecosystem services had been included in the analysis, the experts might have arrived at a different answer. Why are ecosystem services rarely included in economic analyses?