Which Is True for Mass Spectrometry of Proteins

question 16

Multiple Choice

Which is true for mass spectrometry of proteins?
I MALDI and electrospray are major methods for introducing proteins into the gas phase.
II The equation is used to determine the number of H⁺ bound to a protein from the mass spectrum.
III Once n is known;the molecular mass of the protein is calculated,molecular mass = nm_n.
IV Electron-transfer dissociation is a mass spectrometry technique to sequence proteins.

• A)I,II,and IV
• B)II and IV
• C)III and IV
• D)I,III,and IV
• E)II and III

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Definitions:

Addition Polymer

A polymer formed by the successive addition of monomer molecules with unsaturated bonds, such as in polyethylene or polystyrene production.

Condensation Polymer

A type of polymer formed by the reaction of two monomers with the simultaneous elimination of small molecules such as water, resulting in a bond between the monomers.

ε-Caprolactam

A cyclic amide or lactam, used as a monomer in the production of Nylon 6 through ring-opening polymerization.

Nylon 6

A type of polyamide or nylon made from a single monomer, caprolactam, characterized by its long, repetitive chains, used in textile and plastic industries.