Question

question 24
you viewed an experiment that used iodine, starch, and dialysis tubing.
we found out that certain molecules are too large to cross the cell membrane with passive transport alone.
from the experiment, which molecule was too large to cross the membrane of the dialysis tubing?
water
food - dye
iodine
starch

Explanation:

Dialysis tubing is a semi - permeable membrane. Small molecules like water (small, polar), iodine (small, non - polar in its molecular form \(I_2\)), and food - dye (relatively small) can pass through the membrane via passive transport. Starch is a large polymer (a polysaccharide made of many glucose units linked together). Its large molecular size prevents it from crossing the dialysis tubing membrane through passive transport alone.

Answer:

starch