A single seed lands on one of a group of isolated islands. Several million years later, its descendants
have evolved into a number of new species on the different islands, representing a variety of trees,
shrubs, and vines. At that point in time, we have an example of
a. adaptive radiation.
b. punctuated equilibrium.
c. genetic drift.
d. microevolution.
e. mutation.
A
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Which of the following is true of DNA?
A. The nucleotides in one strand are connected by hydrogen bonds. B. A phosphate group in a nucleotide is attached to the 3 carbon in ribose. C. A purine always forms a complementary base pair with a pyrimidine. D. The percentage of the purine A always equals the percentage of the purine G. E. It is used by ribosomes for translation.
One can inject dyes of different sizes into a liver cell and determine those molecules that can readily pass through gap junctions. What sized molecules can pass through gap junctions?
A. <1,000 Daltons B. >1,000 Daltons, but <1,500 Daltons C. >10,000 Daltons D. >5,000 Daltons, but <10,000 Daltons E. >1,500 Daltons, but <5,000 Daltons
In the ecosystems of the world, fungi act primarily as
A. primary consumers. B. producers. C. decomposers. D. detritovores. E. secondary consumers.
The process of producing proteins from DNA involves two different steps. What is the term used to describe each step, and what happens during each of these steps?
What will be an ideal response?