Amphibians use lungs and ________ for gas exchange.
a. None of these choices
b. gastrovascular cavity
c. book lungs
d. gills
e. skin
e
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Which of the following statements describes the hypothesis proposed to explain the regular arrangement of leaves around the stem?
A. Primordia are pre-programmed to grow in a set arrangement. B. Primordia are unable to communicate. C. Chemical signals from developing leaf primordia create regions preventing new primordial growth. D. Developing leaf primordia physically block new primordial. E. We do not currently have a hypothesis to explain how these growth patterns occur.
The technique by which DNA, RNA, or protein molecules are separated in a gel that is subjected to an electric field is
called ____.
a. PCR b. biotechnology c. amplification d. a restriction enzyme digestion e. gel electrophoresis
In the decolorizing step of the Gram stain, which reagent is used?
a. Alcohol-acetone b. Malachite green c. Iodine d. Crystal violet
Oral lesions called Koplik's spots are seen in patients with
A. influenza. B. croup. C. rubella. D. measles (rubeola). E. mumps.