Most innate immune responses rely on
A. recognition of specific antigens.
B. pathogens being engulfed and destroyed.
C. plasma cells to secrete antibodies.
D. IgM antibodies.
E. clonal selection to replicate specific lymphocytes.
B. pathogens being engulfed and destroyed.
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The degree of relatedness between a niece and an uncle is _____, and the degree of relatedness
between first cousins is ______.
a. 0.75; 0.50 b. 0.50; 0.25 c. 0.25; 0.125 d. 0.125; 0.0625 e. 0.0625; 0.03125
Ancestors of the Galàpagos finches had two different types of seeds to eat on some islands. Some seeds were very small, and required small beaks to handle, other seeds were very large and required large strong beaks to crack. This led to among the Galàpagos finches.
A. disruptive selection B. stabilizing selection C. directional selection D. sexual selection E. artificial selection
In the central nervous systems, axons of several neurons traveling together are called ____
a. nuclei b. fibers c. bundles d. tracts e. filaments
All of the following descriptions of embryonic stem cells are true EXCEPT that they ________
A) are derived from the inner cell mass of a blastocyst B) are self-renewing C) are present in all adult tissues D) are pluripotent E) can differentiate into all body cells