Question

a _____ solution has a lower concentration of solute outside the cell than inside, causing water to flow into the cell by osmosis.
your answer

a cell needs to move glucose molecules from a high concentration outside the cell to a lower concentration inside. the glucose molecules are too large to pass through the lipid bilayer directly.
which process does the cell use to move these molecules, and why does it not require energy?
○ endocytosis, because the cell engulfs large molecules using vesicles.
○ facilitated diffusion, because transport proteins help move molecules down their concentration gradient without using energy.
○ active transport, because it moves molecules against the concentration gradient.
○ simple diffusion, because glucose easily passes through lipids.

a red blood cell is placed in a solution that has the same concentration of water and solutes as the inside of the cell. what will happen to the cell?

Explanation:

1. A solution with a lower solute concentration outside the cell than inside is a hypotonic solution. In such a case, water moves into the cell by osmosis.
2. For the glucose - transport question, facilitated diffusion is the correct process. Glucose is a large molecule and cannot pass through the lipid bilayer directly. Facilitated diffusion uses transport proteins to move molecules down their concentration gradient without using energy. Endocytosis is incorrect as it involves engulfing substances in vesicles and is not relevant here. Active transport moves molecules against the concentration gradient and requires energy, which is not the case here. Simple diffusion is incorrect because glucose cannot easily pass through lipids.
3. When a red - blood cell is placed in a solution with the same concentration of water and solutes as the inside of the cell (an isotonic solution), there is no net movement of water, and the cell will maintain its shape and size.

Answer:

1. Hypotonic
2. B. Facilitated diffusion, because transport proteins help move molecules down their concentration gradient without using energy.
3. The cell will maintain its shape and size.