The presence of bicarbonate ions in the blood has an important direct effect, aside from the transport of CO2, that involves
A) altering the affinity of hemoglobin for oxygen.
B) stimulating the proliferation of alveolar epithelial cells.
C) altering the activity of carbonic anhydrase.
D) altering the activity of several receptors.
E) maintaining acid-base balance.
Ans: E) maintaining acid-base balance.
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Intertidal chitons and snails use the ____ as a means of attachment to the rocks
a. foot b. mantle c. visceral mass d. head e. radula
The "Age of Fishes" is an informal name for the:a
Ordovician period. b. Silurian period. c. Devonian period. d. Permian period. e. Carboniferous period.
The first genetically modified food product available for human consumption in the United States was ________
A) the Flavr Savr tomato B) Golden Rice C) ice-minus bacteria D) RoundUp Ready corn E) Bt corn
The enzyme salivary amylase in the mouth breaks down starch into the simple sugar glucose. The mouth has a pH of 7. Salivary amylase will
A. also break down starch in the stomach, which has a pH of 2. B. be able to break down proteins to amino acids in the stomach. C. not be able to break down starch in a test tube. It needs to be in the mouth. D. work at temperatures lower than body temperature (37°C).