Cell-mediated immunity is directed by:
a. B cells, which secrete antibodies.
b. T cells, which secrete antibodies.
c. macrophages, which produce histamines.
d. B cells, which react with antigen-MHC complexes.
e. T cells, which react with antigen-MHC complexes.
E
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Light consists of units of energy called
A. electrons. B. photons. C. calories. D. neutrons. E. pigments.
The chemical oxygen demand (COD) of a body of water is determined using a(n)
A) microelectrode. B) oxygenator. C) spectrophotometer to determine the OD540nm. D) strong oxidizing agent.
On a short-term basis, water loss in plants may be controlled by the
A. opening of the stomata in the leaves to allow more carbon dioxide to enter. B. closing of the stele in the roots. C. bending of the petioles on the leaves. D. opening the Casparian strips in the roots. E. closing of the stomata in the leaves to limit transpiration.
The failure of the potato crop and the subsequent
Irish famine was due mainly to a protist belonging to which group? a. chytrids b. slime molds c. club fungi d. parabasalids e. water molds