Question

question 23
1.5 pts
the difference between pinocytosis and receptor - mediated endocytosis is that...
○ pinocytosis brings only water molecules into the cell, whereas receptor - mediated endocytosis brings in other molecules as well.
○ pinocytosis increases the surface area of the plasma membrane, whereas receptor mediated endocytosis decreases the plasma membrane surface area.
○ pinocytosis is nonselective in the molecules it brings into the cell, where as receptor - mediated endocytosis is highly selective.
○ pinocytosis requires cellular energy, but receptor - mediated endocytosis does not.
○ pinocytosis generally concentrates substances from the extracellular fluid, but receptor - mediated endocytosis does not.

Explanation:

• Analyze each option:
• Option 1: Pinocytosis takes in extracellular fluid (with various solutes), not just water. Eliminate.
• Option 2: Both pinocytosis and receptor - mediated endocytosis involve vesicle formation; pinocytosis doesn't increase membrane surface area uniquely, and receptor - mediated also doesn't decrease it in a distinct way. Eliminate.
• Option 3: Pinocytosis is a non - selective uptake of extracellular fluid. Receptor - mediated endocytosis uses receptors to target specific molecules (highly selective). This matches the key difference.
• Option 4: Both processes are types of endocytosis and require cellular energy (ATP). Eliminate.
• Option 5: Receptor - mediated endocytosis concentrates specific substances, while pinocytosis is non - selective and doesn't concentrate. Eliminate.

Answer:

C. pinocytosis is nonselective in the molecules it brings into the cell, whereas receptor - mediated endocytosis is highly selective.