Salmonella enteritidis causes a food-borne illness that kills 400 to 600 Americans each year. It is found mainly in poultry products
Rather than give large doses of antibiotics to poultry, some poultry producers infect the intestinal tract of hens with a harmless bacteria, resulting in a dramatic decrease of S. enteritidis found in the chickens. In this case, what principle did the producers use? A) mutualism
B) predation
C) competitive exclusion
D) parasitism
C
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Which process is responsible for the evolution of mitochondria and chloroplasts in eukaryotes?
a. endosymbiosis b. conjugation c. transformation d. transduction
. Using the logistic growth curve shown in the graph and what you know about population growth, what is represented by the dashed line?
a. biotic potential
b. exponential growth
c. carrying capacity
d. extinction of the population
The pleasurable feeling one gets from taking
Ecstacy is related to the neurotransmitter
a. endorphin. b. acetlycholine. c. dopamine. d. serotonin. e. epinephrine.
Which of the following contains a coded message of how to construct a protein?
A. ATP B. tRNA C. ribosome D. mRNA