You find a cell of a type you have never seen before. The cell has both a nucleus and a cell wall. Therefore, you conclude that it must be a __________ cell.
A. prokaryotic
B. animal
C. bacterial
D. plant
Ans: D. plant
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Coral reefs found very close to the shore of islands and continents are called:
a. atolls. b. barrier reefs. c. table reefs. d. fringing reefs.
Scientists measured the pressure in the xylem of redwood trees at different heights and found that the higher they made their measurements, the lower the pressure. They extrapolated this to a pressure of zero, and concluded that the tallest a tree could grow is 122–130 meters. The tallest known tree on Earth is 112.7 meters. Which of the following most likely limits the height of trees?
A. amount of transpiration in leaves B. ability to take up CO2 C. strength of water cohesion D. amount of energy needed to pump water to the tops of the trees E. amount of photosynthesis in leaves
Which of the following hormones is produced only
when a woman is pregnant? a. testosterone b. gonadotropic-releasing hormone c. human chorionic gonadotropin d. estrogen e. progesterone
Children have short eustachian tubes, and are susceptible to ____
a. otitis media b. tinnitus c. congenital deafness d. vertigo e. nerve deafness