Which describes the basis of an immunoassay? An electron beam excites atoms within the drug, which give off a characteristic
X-ray spectrum.

The drug gets carried through a stationary phase by a mobile phase and the
retention time identifies the drug.

The drug fragments have specific molecular weights that bind to the antibodies.

The unknown amount of drug in a sample competes with a known amount of
fluorescently labeled drug for binding to an antibody to that drug.

Analyze the central conflict and its in a story to discover the theme. o resolution o protagonist antagonist character

Tara sees a commercial for a brand of pills that promise to boost energy and people perform better in work and school. as people in the commercial talk about how much better they feel when taking the pill, tara notices a message on the bottom of the screen that reads, "this pill is not approved by doctors and has not been tested in controlled experiments." what is the best conclusion that tara should make about the commercial? it is making scientific claims based on subjective observations. it is making scientific claims based on opinions instead of pseudoscientific facts. it is making pseudoscientific claims based on objective observations. it is making pseudoscientific claims based on opinions instead of scientific facts.

Why do we perceive objects as retaining their brightness under different lighting levels?