Seawater typically is
a. highly basic.
b. neutral.
c. somewhat basic.
d. somewhat acidic.
e. highly basic.
C
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After a B cell is activated, it no longer needs T cell interactions or cytokines to make antibody
Indicate whether the statement is true or false.
Living organisms must gather energy and materials from their surroundings to ____
a. build new biochemicals b. grow c. maintain and repair their parts d. produce offspring e. all of these
Mountains produce
a. rain shadows on the windward sides. b. precipitation on the leeward sides. c. deserts on the leeward sides. d. extensive grasslands in the upper elevations on the windward sides. e. any of these.
Cytotoxic T cells release two proteins to destroy infected cells: ________, which forms pores in the membrane of the infected cells, and ________, which enters the infected cell through these pores and triggers apoptosis.
A) fragmentins : perforins B) MHC class I : MHC class II C) perforins : fragmentins D) complement system proteins : perforins E) complement system proteins : fragmentins