All members of a group of ornithologists studying barn owls in the wild have had salmonellosis (Salmonella gastroenteritis). One birder is experiencing her third infection. What is the most likely source of their infections?

a. The ornithologists are eating the same food.
b. They are contaminating their hands while handling the owls and nests.
c. One of the workers is a Salmonella carrier.
d. Their drinking water is contaminated.


Answer: b. They are contaminating their hands while handling the owls and nests.

Biology & Microbiology

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The correct arrangement of flower parts from the outside to the inside is:

A. carpels, stamens, sepals, petals B. petals, stamens, carpels, sepals C. stamens, sepals, petals, carpels D. sepals, petals, stamens, carpels E. stamens, carpels, sepals, petals

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Which of the following organs or tissues can ONLY use glucose as a source of energy?

A. heart B. skeletal muscles like the bicep C. brain D. liver E. spleen

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According to modern phylogeny, based on such data as the arrangement of genes in mitochondrial

DNA and the sequences of ribosomal RNA genes, hexapods are most closely related to which of the following groups?

a. trilobites b. myriapods c. crustaceans d. annelids e. chelicerates

Biology & Microbiology

The scientist given credit for devising the two-word scientific naming system is

A. Carolus Linnaeus. B. Charles Darwin. C. Gregor Mendel. D. Aristotle. E. Louis Pasteur.

Biology & Microbiology