Final answer:
SDS-PAGE is better for determining the size of a protein, while Western Blotting is more suitable for detecting and measuring the presence of a specific protein.
Step-by-step explanation:
The appropriate method for determining the size of a protein depends on the specific goal of the analysis. If the primary objective is to separate and identify proteins based on their size, then SDS-PAGE (Sodium Dodecyl Sulfate Polyacrylamide Gel Electrophoresis) would be the better choice. SDS-PAGE separates proteins based on their size by denaturing them and masking their native charges with SDS. On the other hand, if the aim is to detect and measure the presence of a particular protein, then Western Blotting would be more suitable. Western Blotting allows for the detection of specific proteins using antibodies. It involves immobilizing the proteins on a membrane and then detecting them with labeled antibodies.