#march2020mccqe1
Liver cells in culture were kept at 0 C (32.0 F) and treated with trypsin to digest the receptors on the cell surface. The temperature was then raised to 37.0 C (98.6 F), and radioactive LDL was added to the culture media. Several hours later, the labeled LDL was found to be inside the cells. This specific process of LDL uptake is
(A) active transport
(B) facilitated diffusion
(C) phagocytosis
(D) pinocytosis
(E) receptor-mediated endocytosis
Liver cells in culture were kept at 0 C (32.0 F) and treated with trypsin to digest the receptors on the cell surface. The temperature was then raised to 37.0 C (98.6 F), and radioactive LDL was added to the culture media. Several hours later, the labeled LDL was found to be inside the cells. This specific process of LDL uptake is
(A) active transport
(B) facilitated diffusion
(C) phagocytosis
(D) pinocytosis
(E) receptor-mediated endocytosis