When is the PO2 an especially strong stimulant of the respiratory control center in the brain of healthy individuals?
A. while running a road race along the shoreline of Vancouver
B. while hyperventilating
C. while climbing to the summit of Mt. Everest
D. while hypoventilating
E. while free-diving to a coral reef 60 feet below the surface of the sea
C. while climbing to the summit of Mt. Everest
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As a solution becomes more acidic:
A) H+ concentration increases and pH decreases B) pH increases C) H+ concentration decreases D) pH decreases E) H+ concentration increases
What is the effect of a nonsense mutation in a gene?
A. It introduces a premature stop codon into the mRNA. B. It alters the reading frame of the mRNA. C. It has no effect on the amino acid sequence of the encoded protein. D. It prevents introns from being excised. E. It changes an amino acid in the encoded protein.
Sponges, cnidarians, and flatworms lack a specialized gas exchange surface because
A) they are too large for a circulatory system to operate well. B) they live without need for oxygen. C) they do not produce carbon dioxide. D) countercurrent exchange mechanisms cannot function well in their living conditions. E) nearly all of their cells are in direct contact with the external environment.
Which of the following is a taxon that contains all the other taxa listed?
A. kingdom B. family C. genus D. phylum E. species