CD8 cells are
A. T helper cells.
B.
natural killer cells.
C. T cytotoxic cells.
D.
macrophages.
C
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____ would most likely lead to a rapid decrease in body temperature
a. Cutting the grass b. Exercising c. Falling through the ice d. Getting the flu e. Entering an air conditioned building
Did H. sapiens mate with H. neanderthalensis? How do we know? What will be an ideal response?
Although the reactions of the Calvin cycle do not depend directly on light, they do not usually occur at night. Why?
A) It is usually too cold at night for these reactions to take place. B) Carbon dioxide concentrations decrease at night. C) The Calvin cycle depends on products of the light reactions that cannot occur at night. D) Plants must open their stomata to restore their water balance each night. E) At night, plants have a negative water balance with the soil, due to reduced evaporation
Characteristics between the branch points of a cladogram that are shared by all organisms above the branch point and are not present in any below it are called
A. ancestral characters. B. novel characters. C. homoplastic characters. D. derived characters. E. homologous characters.