Final answer:
SDS-PAGE is a technique used to separate proteins based on size after treating them with SDS, a detergent that denatures the proteins and imparts a negative charge. The option (C) is correct.
Step-by-step explanation:
In the technique known as SDS-PAGE (Sodium Dodecyl Sulfate-Polyacrylamide Gel Electrophoresis), proteins are separated based on size. This is because SDS, a detergent, denatures the proteins and masks their native charges by giving them a uniform negative charge.
The proteins are then separated in a polyacrylamide gel where they migrate due to an applied electric field, with smaller proteins moving faster and thus traveling further through the gel than larger proteins. This method is particularly useful in the identification and characterization of immunoglobulins and antigens. Therefore, option (C) is correct.
This question is not complete, Here I am attaching the complete question:
Many antigens and all immunoglobulins are proteins. The identification of these proteins depends on various techniques that separate and characterize them. One method commonly used in the research laboratory is polyacrylamide electrophoresis of proteins treated with sodium dodecyl sulfate, or SDS-PAGE, which separates proteins based on what factor?
(A) Charge
(B) Affinity
(C) Size
(D) Isoelectric point
(E) Epitope