Convergent evolution occurs when two species living in
A. different areas become reestablished and are able to reproduce.
B. the same area become reproductively isolated.
C. different areas evolve similarities through natural selection acting on those characteristics.
D. the same area are competing for the same resource thus causing one to evolve away from the other.
Answer: C
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Crops that are resistant to the herbicide Roundup ____
a. express the enzyme degraded by Roundup at high levels so that not all of the enzyme is inhibited b. have an extra coating outside their cell wall that inhibits Roundup from entering the cells c. contain a bacterial version of the chloroplast enzyme inhibited by Roundup d. produce a compound that degrades Roundup e. do not have the membrane channels through which Roundup enters the plant
What kind of fruit is formed from the fusion of individually pollinated flowers?
a. aggregate b. simple c. multiple d. fleshy e. dry
Why does removing an overripe, mushy apple from a container of otherwise good apples help preserve the good apples?
A) Chemicals in the overripe apple stimulate the conversion of sugar to starch in the good apples. B) Ethylene production in the good apples is inhibited by the lack of ethylene production in the overripe apple. C) Gibberellins help preserve the good apples. D) The overripe apple makes ethylene gas, which can cause the good apples to ripen more quickly than usual. E) The production of cytokinins is inhibited in the remaining good apples.
When all the precipitation in a small valley feeds a particular stream, the valley is referred to as ____.
A. a basin B. a waterway C. an ecosystem D. an aquifer E. a watershed