The property of a test to detect only a certain antibody or antigen and not to react with any others is ________.
A. precipitation
B. specificity
C. sensitivity
D. cross-reaction
E. agglutination
Answer: B
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Animals that select mates that are phenotypically similar will have ________ when compared with Hardy-Weinberg predictions.
A. more homozygotes. B. more mutations C. more heterozygotes D. less natural selection E. fewer homozygotes
Geologists have evidence that over the past 1.5 billion years
A) Earth's landmasses have remained in the same shape and positions as they have in the current time. B) Earth's landmasses have joined into a single continent and split back apart again on three occasions. C) Earth's landmasses have changed positions extensively but have remained separate and in the same shapes. D) Earth's landmasses have changed shape and have been entirely submerged in water on three occasions.
Which of the following is NOT involved in the regulation of the lac operon?
A) an inducer B) a repressor protein C) an iRNA D) glucose E) cyclic AMP
Which of the following was not an energy source on early Earth?
A. meteorites B. ultraviolet radiation C. lightning D. ozone layer E. volcanoes