The polymerase chain reaction relies upon unusual, heat-resistant ________ that were isolated from bacteria living in hot springs
A) DNA polymerases
B) DNA ligases
C) restriction enzymes
D) plasmids
Answer: A
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Which of the following is an enzyme?
a. fibrinogen b. fibrin c. plateletase d. thrombin e. plasminogen
Which pathway is the foundation for the majority of ecosystems and food chains on Earth?
A) photosynthesis B) anaerobic respiration C) aerobic respiration D) chemosynthesis E) decomposition
Diane Dodd's experiments using fruit flies demonstrated that
A) the evolution of reproductive barriers occurs much too slowly to produce measurable effects in the laboratory. B) new species can form in a single generation by the production of new reproductive structures. C) formation of a reproductive barrier between two populations is more likely if they experience and adapt to different environmental conditions. D) reproductive barriers usually are absolute: Either two populations are fully willing and able to interbreed, or they are strictly separated by a fully effective reproductive barrier.
A young woman comes into the clinic complaining of itchy, red skin and swelling on her arms and legs. She had not been in any parks or wooded areas recently, but she had been shopping. A blood sample reveals elevated levels of granulocytes. What treatment is the physician likely to prescribe at this point?
A) corticosteroids B) cyclophosphamide C) interferon D) methotrexate E) antihistamines