Question

Which of the following drug transport mechanisms across the cell membrane is bidirectional in nature?

• A. \( \text{Passive diffusion} \)
• B. \( \text{Active transport} \)
• C. \( \text{Pinocytosis} \)
• D. \( \text{Facilitated diffusion} \)

Hint:

Pinocytosis is essential for cellular nutrient uptake and removal of extracellular materials.

Answer 1

The Correct Option is C

Pinocytosis is an energy-dependent transport mechanism where cells engulf extracellular fluid via membrane invagination. It allows bidirectional movement of solutes and nutrients, unlike active transport, which is typically directional. Pinocytosis plays a crucial role in macromolecule uptake in biological systems.