Individual initially encounters an immunogen
A. Primary Response
B. IgM
C. Secondary Response
D. IgG
E. Latent Period
F. 1st Exposure
G. 2nd Exposure
F. 1st Exposure
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The frontal bone of an infant is separated into two bones by the
A) coronal suture. B) sagittal suture. C) frontal suture. D) anterior suture. E) longitudinal suture.
When does gene expression occur?
a. when a gene is turned on to produce RNA b. when a gene is turned on to produce DNA c. when a gene is turned on to begin the cell cycle d. when a gene is turned on to begin the process of apoptosis
The most widely accepted model for the evolution of modern humans is pictured here. What is this model called? 
A. Out-of-Africa and Replacement Model B. Hardy-Weinberg C. Multiregional continuity D. Replacement Model E. Out-of-Africa
In a neuron, ion channels permit movement of (but don't pump) ____________.
A) only sodium (Na+) B) only chloride (Cl-) C) sodium (Na+) and chloride (Cl-) D) only potassium (K+) E) sodium (Na+) and potassium (K+)