The More a Sample Can Be Diluted and Yet Still

question 16

Multiple Choice

The more a sample can be diluted and yet still react with antigen, the ______ the concentration of antibodies in that sample and the _______ is its titer.

• A)lower; lower
• B)higher; lower
• C)lower; higher
• D)higher; higher

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Definitions:

Evolution

The method through which various types of life are believed to have evolved and branched out from ancestral forms throughout Earth's history.

Radioisotopes

Unstable isotopes that spontaneously emit radiation; also called radioactive isotopes.

Half-Life

The time required for half the atoms of a radioactive substance to decay or for a drug or other substance to lose half its pharmacologic, physiologic, or radiologic activity.

Potassium-40

A radioactive isotope of potassium used in dating geological materials, as it decays into argon-40 over a known period of time.