Question

lesson quiz
8.3 cell transport
directions
for multiple - choice questions, write the letter that best answers the question or completes the statement on the line provided. for other question types, follow the directions provided.

1. elizabeth is conducting an investigation to study how molecules are transported into and out of a cell. elizabeth builds a model of a cell using a u - shaped tube. a barrier, which is permeable to water, but not sugar, is placed on the bottom of the tube to model the cell membrane. elizabeth adds two different solutions to each side of the tube. the solute in each solution is sugar and the solvent is water. the initial levels of solution in side a and side b are equal. the concentration of sugar in side a is lower than the concentration of sugar in side b.

side a
lower concentration of sugar molecules
side b
higher concentration of sugar molecules
what is elizabeth likely to observe?
a. water molecules will move from side a to side b. the solution level on side a will fall and the solution level on side b will rise.
b. water molecules will move from side b to side a. the solution level on side a will rise and the solution level on side b will fall.
c. sugar molecules will move from side a to side b. the solution level on side a will fall and the solution level on side b will rise.
d. sugar molecules will move from side b to side a. the solution level on side a will rise and the solution level on side b will fall.

Explanation:

La osmosis es el movimiento de agua a través de una membrana semipermeable hacia una solución de mayor concentración de solutos. En este caso, el agua (solvente) se moverá desde el lado A (menor concentración de azúcar) al lado B (mayor concentración de azúcar). Esto hará que el nivel del lado A disminuya y el del lado B aumente. Además, la barrera no es permeable al azúcar, por lo que las moléculas de azúcar no se mueven.

Answer:

a. Water molecules will move from Side A to Side B. The solution level on Side A will fall and the solution level on Side B will rise.