Philodendron flowers have to use a lot of energy to attract beetles as pollinators. This is similar to the energy used by many other flowering plants to produce in order to attract pollinators.
A. spores
B. nectar
C. seeds
D. leaves
E. pollen
B. nectar
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Which of the following is represented by the membrane indicated in the figure?
a. outer mitochondrial membrane
b. plasma membrane
c. nuclear membrane
d. inner mitochondrial membrane
Which of the following mechanisms may be responsible for the occurrance of exon shuffling?
A. double crossover could promote the insertion of an exon into another gene. B. nonhomologous recombination. C. transposable elements may promote the movement of exons. D. both nonhomologous recombination and transposable elements. E. none of these are mechanisms responsible for exon shuffling.
In a certain ecosystem, caterpillars eat grass. Field mice eat the caterpillars and seeds from the grass. Snakes eat the mice. Hawks eat both the snakes and mice. Such an arrangement would be considered a(n)
Select one: a. food web. b. food chain. c. ecosystem. d. first trophic level. e. second trophic level.
Some protozoans can form _________ that allow them to survive environmental hardships
Fill in the blank(s) with the appropriate word(s).