Which statement about digestion in ruminants is FALSE?
A. Ruminant animals have symbiotic bacteria to aid in the digestion of their food.
B. Food materials are re-chewed.
C. Chewing results in mechanically breaking down food and exposing more cellulose to digestive enzymes.
D. Ruminants have a smaller range of foods in their diet than do humans.
E. Ruminants have a single but disproportionately large stomach chamber.
Answer: E
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A human male inherits
A) an X chromosome from both parents. B) an X chromosome from his mother and a Y chromosome from his father. C) both X and Y chromosomes from his father. D) his father's Y chromosome and an X chromosome from either his father or mother.
It has been difficult to generate drugs to treat AIDS for which reason?
A. HIV does not cause AIDS. B. HIV does not use any enzymes that can be targeted by drugs. C. HIV mutates rapidly. D. The only way to kill a virus is with a vaccine, not with drugs. E. People with HIV infections die rapidly, before the drugs have a chance to cure them.
What type of symbiotic relationship is exemplified by mycorrhizal fungi?
A. Atavism B. Parasitism C. Mutualism D. Commensalism
Which of the following is NOT a special property of water?
a. Water converts from a liquid to a gas quickly and over a narrow range of temperatures. b. Water molecules tend to stick together, which can result in surface tension. c. Water can absorb significant amounts of heat energy without changing temperature. d. Water is an excellent solvent.