Bacterial populations have been exposed to an antibiotic and have developed resistance to the
antibiotic over time. Would this be an example of stabilizing selection, directional selection, or
disruptive selection? Explain your reasoning. What will be an ideal response?
Concepts to Consider: This is likely directional selection, due to selection for the bacteria with the
resistance, and against those without the resistance
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Jean-Luc Eiselé and his coworkers used ______ receptors in their research on neurotransmitter
receptor function.
a. African clawed frog b. toad c. artificial d. dog e. human
Sodium chloride (KCl) in water can be
described by any EXCEPT which of the following? a. K+ and Cl? form b. a solute c. ionized d. forms hydrophobic interactions e. dissolved
Which of the following bacteria is responsible for the most common bacterial gastroenteritis in the United States, usually accompanied by frequent, bloody diarrhea?
A) Borrelia recurrentis B) Campylobacter jejuni C) Chlamydophila pneumoniae D) Vibrio cholerae E) Vibrio vulnificus
What does it mean when we say a vaccine is based on an "attenuated" virus?
A) The vaccine isn't the virus at all, just similar-shaped chemicals. B) The vaccine is based on a virus that has been rendered harmless by lab-induced mutation. C) The vaccine is a similar species to the virus that isn't harmful (e.g., cowpox for smallpox). D) The vaccine is a live virus that has been heat-killed. E) The vaccine is a live virus that has been chemically damaged.