Practice question
Question
A mixture of four peptides, PKKRK, RGERV, RYRGV and LVVYP, is loaded onto an ion-exchange column at pH = 7.2. If carboxymethyl (CM) cellulose is used as the stationary phase of this column, then which peptide elutes first?
Explanation
This outcome reflects membrane organization, where lipid bilayer and protein trafficking maintain compartmentalization. Option D captures this correctly because it aligns with organelle function and transport, consistent with textbook descriptions and experimental observations in cell biology.
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