Cell Structure and Function

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

• contractile vacuole

• cell membrane

• ribosome

• lysosome

Tags

NGSS.HS-LS1-3

​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 _________________ because there is a lower concentration outside the cell than inside the cell.​

• remain in the cell

• move into the cell

• move out of the cell

Tags

NGSS.HS-LS2-3

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.

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

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

What type of solution is this cell in? What would be the net movement of water? Select all that apply.

• hypotonic

• out of the cell

• hypertonic

• into the cell

• isotonic

Tags

NGSS.HS-LS1-3

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

• homeostasis

• plasmolysis

• turgor

• expansion

Tags

NGSS.HS-LS1-3

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

If the sodium concentration inside a cell is greater than outside the cell, how can a cell take in more sodium?

• osmosis
• diffusion
• active transport
• passive transport

Tags

NGSS.MS-LS1-2

___________________ solutions have the same concentration of water and solutes inside and outside cells allowing cells to retain their normal shape.​