Most ulcers are caused by____
a. eating spicy food
b. overuse of aspirin
c. bacterial infection
d. stress
e. poor diet
ANSWER: c
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Many carnivores have lost their taste receptor that detects:
a. bitterness b. saltiness c. sweetness d. sourness e. fattiness
Three species of tigers have become extinct due to overharvesting or habitat destruction. This is an example of
A. mass extinction. B. background extinction rate. C. sympatric speciation. D. increased extinction rate by human activity. E. allopatric speciation.
The conspicuous structures on the surface of a dead tree that indicate a fungus is growing inside are for
A) defense. B) pollination. C) feeding. D) show only. E) reproduction.
Which of the following bacteria causes Hansen's disease?
A. Mycobacterium tuberculosis B. Clostridium difficile C. Listeria species D. Corynebacterium species E. Mycobacterium leprae