What type of genetically-engineered organism produces drugs that treat cystic fibrosis and prevent blood clots?
a. Bacteria
b. Dogs
c. Mice
d. Goats
e. Viruses
ANSWER: d
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The invertebrate group most closely related to the vertebrates is:
A. Echinodermata B. Urochordata C. Cephalochordata D. Ophiouroidea E. Notochordata
Which of the following is true regarding some insect tracheal systems?
a. They are associated with the blood circulatory system. b. They excrete body wastes as well as transport gases. c. Their spiracles can become clogged by spraying them with oil. d. The tracheal tubes are continually open in large terrestrial insects. e. They contain respiratory pigments to enhance oxygen transport.
________ reactions release energy when electrons are removed from a substance
Fill in the blank with correct word.
Ammonia, urea, and uric acid
A. are all equally toxic. B. are all produced by the kidney. C. all require about the same amount of energy to produce. D. are all nitrogenous wastes. E. all require large amounts of water for excretion.