Effector helper T cells release cytokines only
when which of the following occur?
a. The effector helper T cell binds to an
antigen-presenting dendritic cell.
b. The effector helper T cell binds to a
memory T cell.
c. The effector helper T cell binds to a
complement protein.
d. The effector helper T cell binds to MHCantigen
complexes on B cells.
e. Any of these can stimulate cytokine
production.
D
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A process that results in individuals of two populations losing the ability to interbreed is referred to as
(a) stabilizing selection. (b) fusion. (c) speciation. (d) differential migration.
The presence of the SRY gene product has the effect of ________
a. preventing the formation of testes b. making the gene carrier male c. all of the choices d. triggering the formation of ovaries
The single greatest reservoir(s) of carbon exist(s) in ____
a. the atmosphere b. land food webs c. the ocean d. rocks and sediments e. marine organisms
Which statement accurately describes the properties of sound?
a. The frequency of a sound determines the loudness. b. The amplitude of a sound determines its pitch. c. The amplitude of a sound is the number of waves per second. d. A soft sound has a greater amplitude than a loud sound. e. A high note and a low note with the same amplitude are equally loud.