Which of the following is NOT an example of a walled-off site of infection that contains a fluid made of dead and dying tissue cells, leukocytes, and pathogens?
A) a boil
B) an abscess
C) a pimple
D) a pustule
E) a tumor
E
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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
The border across which genes can flow between two populations is called the
a. contact zone. b. parapatric zone. c. zone of speciation. d. demilitarized zone. e. zone of polyploidy.
Which one of the following is the most accurate description of the pedigrees used in human genetics?
A. Family tree charts showing who has/had a particular trait. B. Certificates verifying that an individual has a particular trait. C. Certificates of good genetic health. D. Family tree charts showing everyone's birth and death dates. E. Family tree charts showing photographs of all individuals.
?Which of the following rules are followed when naming bacterial cells? Select one or more:
a. ?The genus and species names are underlined. b. ?The species name is capitalized and written first. c. ?The genus and species names are italicized. d. ?The genus name is capitalized and written first.