Tiny droplets of fluid can enter and cross a cell membrane from the outside in a process called
A) phagocytosis.
B) active transport.
C) passive transport.
D) pinocytosis.
E) receptor-mediated endocytosis.

Question

Quizplus · Accepted Answer

Pinocytosis is the process by which cells take in small droplets of fluid from the surrounding environment, including extracellular fluid, through an invagination of the cell membrane, forming a small vesicle that can be transported across the cell membrane. Phagocytosis is the process by which larger solid particles, such as bacteria or viruses, are engulfed and transported across the cell membrane. Active transport requires the input of energy to move molecules or ions against their concentration gradient, while passive transport occurs down the concentration gradient without the input of energy. Receptor-mediated endocytosis is a specific form of endocytosis in which molecules bind to receptors on the cell membrane before being transported into the cell.

Tiny Droplets of Fluid Can Enter and Cross a Cell