In a chemical analysis of an animal tissue sample, which element would be in the least quantity?
A. nitrogen
B. hydrogen
C. carbon
D. oxygen
E. iodine
Answer: E
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Birds that have long narrow bills used for eating bivalves and other invertebrates are:
a. gulls. b. pelicans. c. shore birds. d. tubenoses. e. skuas and jaegers.
Which of the following is an advantage of water as a respiratory medium?
a. Water holds less O2 than air. b. In water, O2 concentration can be affected by solute concentration. c. The density of water makes it more difficult to ventilate over the respiratory surface. d. In water, O2 concentration can be affected by temperature. e. Water keeps the respiratory surface wetted.
Carbohydrate molecules:a
serve as structural components of human cell walls. b. form the regulatory compounds known as enzymes. c. are a source of energy. d. help protect vital organs from damage. e. contain the genetic information of a cell.
What would happen to people exposed to a chemical warfare agent that blocked acetylcholine from binding to muscle receptors?
A) Action potentials would be continuously generated, causing convulsive muscle contractions. B) Muscle contractions would be prevented, causing paralysis. C) Muscle contractions could still occur, but relaxation of the muscle would be impaired. D) Action potentials would be continuously generated, causing convulsive muscle contractions; muscle contractions would then be prevented, causing paralysis.