The most common isotope of carbon has an atomic number of 6 and a mass number of 12, while the

most common isotope of oxygen has an atomic number of 8 and a mass number of 16. A molecule of
CO2 made up of these common isotopes has a molecular weight of ____.



a. 28
b. 44
c. 56
d. 14
e. 22


B

Biology & Microbiology

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Frogs and toads belong to the ____ lineage

a. Caudata b. Aves c. Squamata d. Gymnophiona e. Anura

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____ form in the bone marrow, but ____ mature in the thymus

a. B cells; T cells b. T cells; B cells c. B and T cells; B cells d. B and T cells; T cells

e. B and T cells; B and T cells

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Natural selection operates to produce changes in

a. individuals. b. populations. c. races. d. phyla. e. animals only.

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Which is the persistent survival and multiplication of microorganisms on/in a host called?

A. Infection B. Colonization C. Nosocomial Infection D. A reservoir

Biology & Microbiology