Genetic drift affects
a. allelic frequencies only
b. genotypic frequencies only
c. phenotypic frequencies only
d. allelic, genotypic, and phenotypic frequencies
d
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Water induces embryonic plant cells to release the hormone ________
a. gibberelin b. ABA c. auxin d. ethylene
If the small groups of Viking explorers in Greenland and North America had survived and given rise to new populations, such a scenario would be an example of
A. genetic drift among the original Viking explorers. B. gene flow from continent to continent. C. the founder effect. D. the bottleneck effect. E. directional selection.
Which bacteria have been found in 10% of powdered infant formula and have been linked to several fatal outbreaks of meningitis in children's hospitals?
A) Bacillus cereus B) Clostridium botulinum C) Enterobacter sakazakii D) Listeria monocytogenes
Assume that your lab partner swabs the side of his face and uses the swab to inoculate a nutrient agar plate. The next day, he performs a Gram stain on the colonies. They are gram-positive cocci. You advise him that he should next look for
A) an acid-fast reaction. B) a coagulase reaction. C) conidiospores. D) pseudohyphae. E) pseudopods.