Answer: Size (molecular weight).
- A Charge only
- B Size (molecular weight)
- C Isoelectric point
- D Amino acid composition
Correct answer: B. Size (molecular weight)
Explanation: SDS-PAGE: SDS denatures proteins and gives them uniform negative charge proportional to size. Proteins separate by size in polyacrylamide gel.
Animal cell structure with major organelles labeled. Image: LadyofHats (Mariana Ruiz), Public Domain, via Wikimedia Commons.
Concept context
Cell theory, prokaryotic vs eukaryotic cells, organelles and their functions. Foundation of all biology.