Question

1. which of the following does not affect a molecules ability to cross a cell membrane?

○ polarity of the molecule
○ energy of the cell
○ size of the molecule
○ concentration inside and outside of the cell

Explanation:

• Polarity of the molecule: The cell membrane has a non - polar interior. Polar molecules have a harder time crossing compared to non - polar ones.
• Size of the molecule: Smaller molecules can more easily pass through the membrane (e.g., simple diffusion for small non - polar molecules).
• Concentration inside and outside of the cell: Concentration gradients drive passive transport (e.g., diffusion, facilitated diffusion).
• Energy of the cell: While energy (in the form of ATP) is required for active transport, many molecules cross the membrane via passive processes (diffusion, facilitated diffusion) that do not require the cell's energy input for the basic crossing mechanism (although some carrier - mediated facilitated diffusion may have energy - related aspects in terms of carrier protein function regulation, it is not a fundamental factor for the ability to cross in the same sense as the other three).

Answer:

energy of the cell