It appears that early Homo sapiens ____
a. interbred with Australopithecus afarensis
b. originated in Oregon
c. interbred with Neanderthals
d. migrated from North America to Africa
e. never lived alongside Neanderthals
ANSWER: c
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What is the primary factor limiting scientists' ability to sequence each individual's entire genome?
A. doctor referrals B. financial resources C. patient consent D. computing power E. laboratory space
Which is a characteristic of retrotransposons, but not of DNA transposons?
A) include a gene that encodes reverse transcriptase B) may be present in a genome from one to millions of times C) found only in humans D) may not have a function in their host E) have short DNA sequences that are inverted repeats of each other on the ends
Populations
a. are only limited by one factor at a time. b. increase arithmetically. c. may increase indefinitely. d. are limited by the carrying capacity. e. overcome limiting factors by increasing their biotic potential.
Answer the following questions in reference to the four geologic periods listed below.
A. Asteroid impact at the K-T boundary caused extinctions. B. Human practices are the major agents of extinction. C. D. Volcanic activity in what is now Siberia released a large amount of carbon into the atmosphere causing extinctions. E. Oceans became anoxic, and methane burned on land. F. The greatest mass extinction event where 90 to 95 percent of all species were lost