Question

this video shows the simple diffusion of carbon dioxide molecules. the diffusion of carbon dioxide is called simple because carbon dioxide can diffuse directly through the phospholipid bilayer without assistance. select the true statements. diffusion is a form of passive transport. carbon dioxide can move across cell membranes via simple diffusion because it is large and polar. carbon dioxide only crosses the cell membrane in one direction. the unassisted diffusion of molecules directly through the phospholipid bilayer is called simple diffusion.

Explanation:

• Diffusion is a form of passive transport: Passive transport does not require energy input. Diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration, which occurs spontaneously without the cell expending energy.
• Carbon dioxide can move across cell membranes via simple diffusion because it is large and polar: Carbon dioxide (\(CO_2\)) is a small, non - polar molecule. Small non - polar molecules can pass through the phospholipid bilayer (which has a non - polar interior) easily. So this statement is false.
• Carbon dioxide only crosses the cell membrane in one direction: Carbon dioxide movement across the membrane depends on the concentration gradient. If the concentration is higher inside the cell, it will move outside and vice versa. So it can move in both directions depending on the concentration, and this statement is false.
• The unassisted diffusion of molecules directly through the phospholipid bilayer is called simple diffusion: This is the definition of simple diffusion as described in the video (e.g., \(CO_2\) moving through the bilayer without assistance).

Answer:

• Diffusion is a form of passive transport.
• The unassisted diffusion of molecules directly through the phospholipid bilayer is called simple diffusion.