The mammalian circadian pacemaker is located in the
A. suprachiasmatic nucleus.
B. brainstem.
C. somatosensory cortex.
D. adrenal gland.
E. hippocampus.
A. suprachiasmatic nucleus.
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An ecologist recorded twelve white-tailed deer, Odocoileus virginianus, per square kilometer in one woodlot and twenty per square kilometer in another woodlot. What was the ecologist comparing?
A) density B) dispersion C) carrying capacity D) cohorts E) range
Judah Folkman performed an experiment in which he found that small tumors floating in the anterior chamber of the eye grew little, whereas a similar tumor implanted directly onto the iris grew to thousands of times its original size
These results supported his idea that continued tumor growth is dependent on requirement of tumor growth for A) continued exposure to a carcinogen. B) evasion of apoptosis. C) angiogenesis. D) metastasis. E) a stepwise series of gene mutations.
Crossing over during prophase I results in ________
A) nondisjunction B) reciprocal translocation C) duplication D) genetic recombination
Thinking of the examples in your book of adaptive radiation, in which of the following environments might you be most likely to find adaptive radiation?
A) in earthworms feeding on detritus B) among insects that are generalist feeders C) in fruit flies that feed on different yeast strains specific to different species of cacti in the desert D) among houseflies living in a garbage dump