As the air is saturated with water vapor (humidified) upon entry into the conducting pathway, there will be
A) a selective increase in the partial pressure of nitrogen.
B) a selective decrease in the partial pressure of nitrogen.
C) an increase in the partial pressure of the remaining gases.
D) no change in the partial pressure of the remaining gases.
E) a decrease in the partial pressure of the remaining gases.
Answer: E) a decrease in the partial pressure of the remaining gases.
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Inactivation of a cell-surface receptor depends on:
A. the binding affinity of the receptor. B. the activity of phosphatases in the cytosol. C. the concentration of ligand surrounding the cell. D. both the binding affinity of the receptor and concentration of ligand surrounding the cell.
Flowering plants originated during the
A. Permian Period. B. Tertiary Period. C. Devonian Period. D. Cretaceous Period. E. Jurassic Period.
In people with PKU, phenylalanine from dietary proteins cannot be converted to tyrosine
a. True b. False
A transcription factor, Prx1, is essential for forelimb growth in mammals. The forelimbs of mice are legs and the forelimbs of bats are wings
If the enhancer region of Prx1 in mice is replaced with the enhancer region of the bat Prx1, the resulting fore-limbs of the transformed mice are 6% longer than normal. Explain this result. What will be an ideal response?