Which group in a food web is responsible for returning inorganic compounds back to the environment?
A. tertiary consumers
B. decomposers
C. primary producers
D. primary consumers
E. secondary consumers
B
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Transfer of genetic information via direct cell-cell contact is called
A. transduction. B. transformation. C. transfection. D. conjugation.
The major phagocytic cells in the body are
a. macrophages and monocytes. b. macrophages and neutrophils. c. macrophages and mast cells. d. monocytes and mast cells. e. monocytes and basophils.
Economic liberalism is:
A) a word that denotes both the ideology of using markets to organize society and a set of specific policies to free markets from state intrusion. B) the philosophy that social progress comes when individuals freely pursue their self-interests in unregulated markets. C) the philosophy that active state intervention can stabilize the economy and stimulate employment. D) the philosophy of an open society in which the state does not interfere with rights of individuals.
Which statement is not true about MHC II?
A) MHC II interacts with the CD4 receptor on T helper cells. B) MHC II primarily displays extracellular antigens which have been phagocytized. C) MHC II is present only on antigen-presenting cells. D) When bound to antigen, MHC II serves a key role in activation of the appropriate T cells. E) MHC II interacts with both the CD4 and CD8 receptors on T helper and T cytotoxic cells.