Question

Which one of the following molecules can MOST easily pass through the plasma membrane unassisted?
A. Ca2+, a positive ion

B. Cl−, a negative ion

C. CO2, a nonpolar gas

D. glucose, a large sugar

(NOTE: I don't know why this was taken down and I don't know what guidelines I supposedly violated, but I would appreciate if someone helped me answer this question. )

Answer 1

The molecule that can MOST easily pass through the plasma membrane without assistance is carbon dioxide (CO2). Diffusion is a type of passive transport that occurs when molecules move in favor of a concentration gradient.

During diffusion, molecules move high concentration to a region of low concentration.

Oxygen (O2) and carbon dioxide (CO2) are non-polar gasses that move across cell membranes by a process called simple diffusion.

Simple diffusion is a type of passive transport that does not require energy to move substances across cell membranes.

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