Apentix/AP Biology/Unit 2: Cell Structure and Function/Question
AP Biologyeasymcq1 pt

Intestinal cells import cholesterol from the bloodstream after LDL particles bind matching receptors that gather in coated pits on the outer membrane surface. Which process brings LDL inside these cells?

A.Phagocytosis, which engulfs large solid particles whole
B.Pinocytosis, which samples whatever dissolved material happens to be outside
C.Receptor mediated endocytosis, in which ligand binding triggers vesicle formation at coated pits
D.Facilitated diffusion through carrier proteins, since cholesterol moves down its gradient without vesicles

Explanation

Core Concept

Binding of LDL to its receptors concentrates cargo at clathrin-coated pits, and the membrane folds inward to capture the complex inside a vesicle. This selective route lets cells import specific molecules that circulate at low concentrations. Phagocytosis and pinocytosis lack this receptor-based sorting step, so neither can target LDL specifically.

Correct Answer

CReceptor mediated endocytosis, in which ligand binding triggers vesicle formation at coated pits

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