Taste buds contain taste cells that convert chemical signals into action potentials.
a. true
b. false
Answer: a. true
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Salivary amylase begins the breakdown of what substance?
a. amino acids b. lipids c. starch d. protein
What is the enzyme responsible for converting free carbon dioxide in the blood into forms in which it can be transported in the blood?
a. carbonic anhydrase b. carboxypeptidase c. carbonase d. decarboxylase e. dehydrogenase
When you observe a lake that has been affected by acid deposition, you might expect to find
A) low levels of toxic metals and nutrients essential for the growth of biotic organisms. B) excess carbon that will contribute to global warming. C) high levels of dissolved sulfur dioxide. D) a clear lake with high levels of aluminum, mercury, and lead, but few fish. E) a murky lake with excess algal growth from the deposition of anthropogenic nitrogen.
It is difficult to estimate current rates of extinction, but we know that extinction rates have risen dramatically in recent years because
A) the fossil record is unreliable. B) current rates of extinction are much higher than that of background rates. C) new species are evolving as fast as species are becoming extinct. D) background extinction rates have increased. E) most species in danger of extinction are microscopic.