The four-chambered heart first evolved among the:a
arthropods.
b. birds.
c. nonavian reptiles.
d. mammals.
e. fishes.
C
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Miller and Urey's initial simulation resulted in the formation of which one of the following?
A. DNA B. glucose C. RNA D. phospholipids E. amino acids
What is the possible advantage of being heterozygous for the sickle-cell gene?
What will be an ideal response?
Animals that are being hunted (often illegally) for body parts thought to have medicinal value include:a
rhinos and bears. b. cheetahs and snow leopards. c. snow leopards and bears. d. wolves and mountain lions. e. mountain lions and black-footed ferrets
When you hyperventilate (breathe too fast), respiratory alkalosis (decreased concentration of hydrogen ions in the blood) can occur, which can cause you to faint. A common but potentially dangerous method to reverse respiratory alkalosis is to hold a
paper bag over your mouth and take normal breaths, thereby rebreathing the exhaled air. How might this method reverse respiratory alkalosis? A) Inhaling oxygen exhaled into the bag will cause oxygen to diffuse back into the blood and react with water to form carbonic acid, and blood pH will decrease. B) Inhaling oxygen exhaled into the bag will cause oxygen to diffuse back into the blood and react with water to form carbonic acid, and blood pH will increase. C) Inhaling carbon dioxide exhaled into the bag will cause carbon dioxide to diffuse back into the blood and react with water to form carbonic acid, and blood pH will increase. D) Inhaling carbon dioxide exhaled into the bag will cause carbon dioxide to diffuse back into the blood and react with water to form carbonic acid, and blood pH will decrease.