Which of the following distinguishes the secondary immune response from the primary immune response?
A) The primary response is specific; the secondary one is not.
B) The secondary response is faster and stronger.
C) The primary response involves B cells; the secondary one involves T cells.
D) The secondary response allows different antigens to be recognized faster.
Answer: B
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a. Yes b. No
A(n) ____ is a type of chemical bond in which
a strong mutual attraction forms between ions of opposite charge.
a. hydrogen bond b. nonpolar bond c. polar bond d. covalent bond e. ionic bond
What basic developmental challenge is solved by the organizer?
A. enhancing migration of cells into the interior of the blastula B. assigning developmental fates to cells along the anterior-posterior axis C. creating an anterior-posterior axis by responding to maternally-deposited protein factors D. creating a dorsal-ventral axis from a spherical ball of cells
Pleiotropic genes
a. act on secondary sexual characteristics. b. influence more than one aspect of phenotype. c. are additive. d. produce lethal effects when homozygous. e. cannot be inherited.