Module 7 Summative

After some important cellular processes, there is an abundance of carbon dioxide (CO2) molecules inside the cell, but not enough molecules outside the cell. CO2 molecules would ___________

• Move into the cell

• Move out of the cell

• Remain in the cell

After some important cellular processes, there is an abundance of carbon dioxide (CO2) molecules inside the cell, but not enough molecules outside the cell. This means there is a ________ concentration outside the cell.

• Lower

• Higher

• Stable

A molecule that is important for cell functioning cannot diffuse through the plasma membrane, but needs a protein that can open and close to allow the molecule to diffuse. What is this protein called?

• Channel protein

• Carrier protein

• Receptor protein

• Motor protein

When a cell is a(n) _______ solution, the cytoplasm and the solution have the same concentration of water and solutes. Therefore, the net movement of water is _________

• Isotonic, zero

• Hypertonic, out of the cell

• Hypotonic, into the cell

The Na+/K+ ATPase pump is an example of active transport, which requires energy to move substances from a higher concentration to a lower concentration.

• True

• False

The net movement of particles from an area of higher concentration to an area of lower concentration is called

• Diffusion

• Molecular pump

• Vacuole

How do carrier proteins facilitate active transport?

• Carrier proteins block the plasma membrane.

• Carrier proteins move substances from a low to a high concentration.

• Carrier proteins move substances from a high to a low concentration.

• Carrier proteins create an isotonic solution.

In cells, the selectivity of the cell membrane is most closely associated with the maintenance of

• Homeostasis

• Plasmolysis

• Turgor

• Expansion

Some animal cells protect themselves from absorbing too much water by "pumping" excess water out. They use a ________________ to do this.

• Cell membrane

• Contractile Vacuole

• Ribosome

• Lysosome

When the concentration of a substance inside the cell is greater than the concentration outside the cell, the solution is said to be

• Hypertonic

• Hypotonic

• Isotonic

• Contractile