The sudden increase in the occurrence of a disease above the expected level is called ________.
A. an endemic
B. hyperendemic
C. sporadic
D. an epidemic
Answer: D
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Genetically based characteristics that make organisms more likely to survive and reproduce are referred to as ____
a. acquired characteristics b. adaptive traits c. favored characteristics d. selective traits e. divergent characteristics
A dome-shaped mass of cells that protects the bottom of the root as it pushes through soil is called the root ________
a. epidermis b. apical meristem c. cap d. tip
The molecular fragment on an antigen molecule that a lymphocyte recognizes and responds to is called a(n) ________.
A. hapten B. epitope C. variable region D. antigen binding site
Melvin Calvin and his colleagues used which of the following to deduce the steps in the Calvin cycle?
A) negative staining B) Drosophila melanogaster C) electron microscopy D) ultracentrifugation E) radioisotopes