Multiple Choice
In passive transport, what typically happens to an animal cell placed in a hypotonic solution relative to its cytoplasm?
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9. Transport Across Membranes
Passive Transport: Diffusion and Osmosis
Multiple Choice
Which of the following pairs correctly lists two major types of passive transport across cell membranes?
A
Endocytosis and exocytosis
B
Diffusion and osmosis
C
Active transport and bulk transport
D
Phagocytosis and pinocytosis
Verified step by step guidance1
Step 1: Understand the definition of passive transport. Passive transport is the movement of molecules across the cell membrane without the use of cellular energy (ATP). It relies on the concentration gradient, moving substances from an area of higher concentration to an area of lower concentration.
Step 2: Identify common types of passive transport. The two major types are diffusion and osmosis. Diffusion is the movement of solutes from high to low concentration, while osmosis is the diffusion of water across a selectively permeable membrane.
Step 3: Review the other options. Endocytosis and exocytosis involve energy and are forms of active or bulk transport, not passive. Active transport requires energy to move substances against their concentration gradient. Phagocytosis and pinocytosis are specific types of endocytosis, also energy-dependent.
Step 4: Conclude that diffusion and osmosis are the correct pair because both are passive processes that do not require energy and involve movement along concentration gradients.
Step 5: Remember that passive transport is essential for maintaining cellular homeostasis by allowing substances to move freely without energy expenditure.
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