Question

which example of transport across the cell membrane does not depend on carrier proteins?
a) endocytosis
b) sodium - sugar coupled transporter
c) sodium - potassium atpase pump
d) amino acid transporter

Explanation:

Endocytosis is a form of bulk - transport where the cell membrane invaginates to engulf substances. It does not rely on carrier proteins for transport. Sodium - sugar coupled transporters, sodium - potassium ATPase pumps, and amino acid transporters are all carrier - mediated transport mechanisms.

Answer:

A. endocytosis