In pines, the mature male gametophyte is called the ____
a. flagellated sperm
b. pollen cone
c. pollen tube
d. pollen grain
e. pollination drop
ANSWER: c
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A new species of aquatic chordate is discovered that closely resembles an ancient form. It has the following characteristics: external armor of bony plates, no paired lateral fins, and a suspension-feeding mode of nutrition. In addition to these, it will probably have which of the following characteristics?
A) legs B) no jaws C) an amniotic egg D) endothermy
How many DNA molecules are found in a human cell?
a. 1,000 b. 46 c. 100 d. 150 e. 10,000
Which of the following groups of organisms is among the most abundant on Earth?
A. primates B. insects C. bacteria D. protozoa
Which of the following is NOT an example of how plant communities continue to support healthy ecosystems?
A) Forests support the water cycle, through evaporation returning water to the atmosphere. B) Leafy trees provide shade, thereby reducing temperatures. C) Plant roots stabilize soil and prevent erosion. D) Plants increase levels of CO2, by releasing CO2 as a by-product of photosynthesis. E) Plants prevent flooding by absorbing water through their extensive root systems.