The idea that evolution proceeds with long periods of stasis with relatively brief bursts of fast evolutionary change is called
A. catastrophism.
B. temporal equilibrium.
C. gradualism.
D. punctuated equilibrium.
E. temporal isolation.
D. punctuated equilibrium.
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The linking number:
A. is negative for most B-form DNAs. B. changes when double-stranded DNA is bent or deformed. C. increases when single-stranded breaks occur in the DNA. D. increases when double-stranded breaks occur in the DNA. E. is the number of times one strand of a closed circular DNA is wound about another.
What occurs during the annealing stage of a PCR reaction?
A. The DNA strands separate B. The DNA polymerase copies the template DNA C. The primers bind to complementary sequences of the template DNA D. The reaction stops
The osmoregulatory process called secretion refers to the _____
A) reabsorption of nutrients from a filtrate B) selective elimination of excess ions and toxins from body fluids C) formation of an osmotic gradient along an excretory structure D) expulsion of urine from the body
The principle of species individuality suggests that in response to climate change, species should migrate
A. as individual species. B. as individual ecosystems. C. through a process of primary succession. D. in response to a steady level of disturbance. E. None of these choices are correct.