Which of the following molecules is least likely to be able to pass through a capillary wall?
A) an enzyme
B) a sodium ion
C) glucose
D) oxygen

Question

Quizplus · Accepted Answer

Enzymes are large proteins that cannot easily pass through capillary walls or cell membranes. Sodium ions and glucose are small enough to pass through capillary walls, but they require transport proteins to move across cell membranes. Oxygen is small and non-polar, allowing it to easily diffuse across capillary walls and cell membranes.

Which of the Following Molecules Is Least Likely to Be