The first cells were probably:a
autotrophic aerobes.
b. heterotrophic aerobes.
c. eukaryotic anaerobes.
d. autotrophic anaerobes.
e. heterotrophic anaerobes.
E
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A new drug is developed that targets and binds to the lipid A portion of LPS from Gram-negative bacterial cells. This drug shows a high degree of activity and binding in a test tube setting against purified lipid A. Based on this information,
A. we should fast track this drug and get it out to physicians immediately to help prevent toxic/septic shock in humans. B. we should do some animal testing with whole Gram-negative cells and the drug before we jump to any conclusions. C. we should next proceed by moving to testing in a test tube using whole Gram-negative cells to see if it binds with the same strength. D. we should abandon the drug entirely. Binding to lipid A won't kill the bacteria, so the drug is useless to develop further. It wouldn't help humans who have septic shock at all.
Morphological differences between European beavers and South American ____ contributed to Darwin's thoughts on
species diversification
a. nutrias b. iguanas c. glyptodonts d. armadillos e. beavers
Discarded or lost drift nets will have a large impact on:
a. schooling fishes. b. marine mammals. c. benthic invertebrates. d. zooplankton. e. both a and b
Which tree species is suffering the largest current tree mortality?
A) trembing aspen B) jack pine C) black spruce D) white spruce