Which of the following is an example of evolution by artificial selection?
A. the migration of invasive species
B. the evolution of different breeds of dog from ancestral wolves
C. the evolution of feathers in the reptile ancestors of birds
D. the evolution of antibiotic resistance in bacteria
E. the evolution of larger beak size in the Galapagos finches
Ans: B. the evolution of different breeds of dog from ancestral wolve
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Which of the following produces histamine in response to an allergic reaction?
a. mast cell b. macrophage c. cytokine d. interferon
T cells
A) mature in the bone marrow. B) circulate in low numbers in the blood. C) produce antibodies. D) function in helping other immune cells.
An intimate relationship between two different species is called
a) predation. b) an ecosystem. c) symbiosis. d) a community. e) competition.
How might efflux pumps increase antibiotic resistance in bacteria?
a. Resistant bacteria may have a greater number of efflux pumps on their cell surfaces. b. Some bacteria can decrease the specificity of their efflux pumps, increasing the number of different antibiotics the pumps can eliminate. c. Some bacteria can change the chemical structure of the antibiotic. d. Efflux pumps can never be modified to increase antibiotic resistance. e. Resistant bacteria can have more efflux pumps, and can have less specific efflux pumps.