Although Earth's ecosystems are remarkably diverse in their characteristics, they all run on energy captured by ____.
A. autotrophs
B. heterotrophs
C. consumers
D. decomposers
E. detritivores
Answer: A
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Restriction enzymes
a. work at recognition sites. b. function only at "sticky ends." c. produce uniform lengths of DNA. d. function in viruses. e. are produced by viruses to break down bacterial DNA
Fossil evidence places the origin of angiosperms in the early Cretaceous period, at least 130 million years ago. By 100 million years ago, all of today's major lineages of angiosperms had evolved. Angiosperms make up 95% of all modern plants species. Which of the following may help explain the rapid success of angiosperms?
A. use of the wind to disperse pollen and seeds B. use of flowers and fruits to protect and disperse both pollen and seeds C. use of the wind to disperse spores D. use of water to disperse pollen and seeds E. All answers are correct.
Why are bacteria able to evolve so quickly?
What will be an ideal response?
An ecologist hypothesizes that predation by a particular owl species is the major factor controlling the population of a particular rabbit species. If this is the case, which of the following population effects could be expected in this rabbit-owl pair?
A) A fall in the owl population should cause a fall in the rabbit population. B) A fall in the rabbit population should cause an increase in the owl population. C) An increase in the incidence of disease in the rabbit population should not change the owl population. D) An increase in the owl population should cause a fall in the rabbit population.