A ____ causes the blood vessels of the skin to relax and increase in diameter

a. decrease in body temperature
b. increase in body temperature
c. electrical stimulus
d. mechanical stimulus
e. chemical stimulus


ANSWER: b

Biology & Microbiology

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The lateral line system provides ________ with a sense of "distant touch," enabling these animals to sense objects that reflect pressure waves and low-frequency vibrations.  

A.  adult amphibians B.  reptiles C.  birds D.  mammals E.  fish

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Addition of a primary carnivore to an ecosystem can sometimes influence the whole ecosystem. This process is called 

A. ecosystem stabilization. B. a bottom-up effect. C. species turnover. D. disruption. E. a trophic cascade.

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What is the significance of the industrial practice of waiting for cultures to enter the stationary phase of growth before harvest?

A. The cells are at peak metabolic activity. B. Secondary metabolites are often the desired product, and are only produced in stationary phase. C. The desired primary metabolites are produced in stationary phase. D. Potential toxins from log phase growth have been depleted. E. An optimal combination of primary and secondary metabolites is being produced.

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Ancestors of the koala lived on the ground, but modern koalas live in trees and eat eucalyptus leaves, which are poisonous to most other animals. The difference between the ancestor and modern koalas was caused by

A. the presence of homologous structures B. the presence of vestigal organs C. selective breeding D. natural selection

Biology & Microbiology