Insects and bacteria appear to team up against a pesticide that is commonly sprayed on crops
The bean bug Riptortus pedestris is a common soybean pest and in a recent study was shown
to acquire resistance to a common insecticide. This resistance is related to the presence of
bacteria (Burkholderia sp.) living within its gut. In this mutually beneficial relationship, more
than 100 million bacteria can live within the insect’s gut. Evidence suggests that these bacteria
are able to break down the pesticide into carbon dioxide, which is used by the bacteria, and
harmless waste products are then secreted. In a recent study, researchers fed bacteria-infested
bean bugs and bacteria-free bean bugs a diet of soybean seedlings that had been treated with
the pesticide. Most of the bacteria-infested bean bugs survived after eating the treated
soybeans, but 80 percent of the bacteria-free bean bugs died.
In the study using bean bugs, soybeans and Burkholderia bacteria, how many domains are
represented?
a. one
b. two
c. three
d. four
B
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What is the most likely reason that bats, raccoons, and foxes readily become infected with the rabies virus, whereas opossums are resistant to infection?
A. The rabies virus is unable to replicate once it has entered the opossum cells. B. Infected opossums do not shed rabies virus in their saliva. C. Opossums rarely contact other infected animals. D. Opossums lack the appropriate receptor for the rabies virus.
In order to transfer all the genes to an F- cell we would need how long?
a. 1 minute b. 20 minutes c. 3 minutes d. 14 minutes e. 5 minutes
Oxidation reactions in biological systems generally involve
A) addition of electrons and hydrogen ions. B) loss of electrons and hydrogen ions. C) addition of electrons and loss of hydrogen ions. D) loss of electrons and addition of hydrogen ions. E) loss of electrons and either addition or loss of hydrogen ions.
Which of the following groups of scientists were influential around the year 1900 in setting the stage for our present understanding of transmission genetics?
A) Watson, Crick, Wilkins, Franklin B) Beadle, Tatum, Lederberg C) deVries, Correns, Tschermak, Sutton, Boveri D) Darwin, Mendel, Lamarck E) Hippocrates, Aristotle, Kolreuter