Question Detail
Question
______ is a process in which portion of the plasma membrane often bud inward so that the cell surrounds portion of the external medium
Correct Answer
Option A is the correct answer.
Detailed Explanation
Endocytosis is the general process by which a cell engulfs external material by folding its plasma membrane inward to form a vesicle. Pinocytosis ('cell drinking') is a type of endocytosis for taking in fluids and dissolved substances. Phagocytosis ('cell eating') is for taking in large particles. The question describes the general process of the membrane budding inward to surround external medium, which is endocytosis.
Hint
What is the general term for taking materials into the cell by infolding the membrane?