Even Though Mass Spectrometry Has Been in Use for Over

question 81

Multiple Choice

Even though mass spectrometry has been in use for over a hundred years,it had only limited use with proteins until the 1980s because

• A)not many proteins had been discovered and purified before the 1980s.
• B)it was not possible to disperse charged proteins into a gaseous stream of particles.
• C)many proteins are difficult or impossible to crystallize.
• D)proteins decompose too quickly into their component amino acids.

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Definitions:

Positive Reinforcement

A technique used in behavioral psychology where a desirable stimulus is presented after a behavior, increasing the likelihood of that behavior being repeated in the future.

Pain Behaviors

Actions or reactions, such as grimacing or moaning, that express or communicate the presence of pain to observers.

Gate Control Theory

A theory suggesting that psychological factors play a role in the perception of pain; the brain can influence the pain signals that pass through the spinal cord's "gates."

Brain and Spinal Cord

Central components of the nervous system, with the brain responsible for processing information and the spinal cord for transmitting information to and from the brain.