Speciation requires ________
A) periods of rapid evolutionary change
B) geographic isolation
C) long periods of time
D) genetic isolation
D
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The primary somatosensory cortex is located:
A. immediately in front of the central sulcus. B. at the back of the brain. C. immediately behind the central sulcus. D. within the temporal lobes.
Which of the following events occurs during mitosis but not during meiosis?
A) Sister chromatids segregate. B) Homologous chromosomes pair. C) Crossing-over occurs between homologous chromosomes. D) Chromosomes align on the metaphase plate. E) None of the choices is correct.
Oxyhemoglobin tends to give up oxygen where
a. the pH is low. b. the tissues are warmer. c. the partial pressure of O2 is low. d. the partial pressure of CO2 is high. e. all of these occur.
One feature of "engineered" plasmids that is helpful in the isolation and analysis of cloned DNA is:
a. they can only handle DNA fragments of up to 10 kb. b. that they are an integral part of all eukaryotic cells. c. they contain no genetic material of their own so that the cloned fragment is truly isolated. d. the presence of genes that allow transformed cells to survive on different media. e. the base sequence of one strand reads the same asits complement