22. What antibody provided the first glimpses of the domain structure ofimmunoglobulins?
A) Myeloma proteins
B) Immunoglobulin A (IgA)
C) Immunoglobulin D (IgD)
D) Immunoglobulin G (IgG)

23. What two imaging techniques were first used to study the structureof immunoglobulins?
A) Electron microscopy and X-ray crystallography
B) Mass spectroscopy and nuclear magnetic resonance
C) Amino acid sequencing and crystallography
D) Fluorescence microscopy and confocal microscopy

24. What is the alternative term for antibody globulins that was coinedby the World Health Organization?
A) Immunoglobulins
B) Globulins
C) Antibodies
D) Antitoxins