Osmosis is a form of passive transport. Which defines osmosis?(1 point)

Question

Responses

the movement of water across a semipermeable membrane up a concentration gradient from low to high, using no energy
the movement of water across a semipermeable membrane up a concentration gradient from low to high, using no energy

the movement of water across a semipermeable membrane down a concentration gradient from high to low, using energy
the movement of water across a semipermeable membrane down a concentration gradient from high to low, using energy

the movement of water across a semipermeable membrane up a concentration gradient from low to high, using energy
the movement of water across a semipermeable membrane up a concentration gradient from low to high, using energy

the movement of water across a semipermeable membrane down a concentration gradient from high to low, using no energy

Endocytosis and exocytosis are forms of active transport. What is active transport?(1 point)
Responses

the movement of molecules down a concentration gradient from high to low, using no energy
the movement of molecules down a concentration gradient from high to low, using no energy

the movement of molecules up a concentration gradient from low to high, using no energy
the movement of molecules up a concentration gradient from low to high, using no energy

the movement of molecules up a concentration gradient from low to high, using energy
the movement of molecules up a concentration gradient from low to high, using energy

the movement of molecules down a concentration gradient from high to low, using energy

What does it mean for an environment to be isotonic?(1 point)
Responses

The concentration of solute in the environment and the concentration inside the cell are at equilibrium.
The concentration of solute in the environment and the concentration inside the cell are at equilibrium.

The concentration of solute is greater in the environment than inside the cell.
The concentration of solute is greater in the environment than inside the cell.

The concentration of solute is greater inside the cell than in the environment.
The concentration of solute is greater inside the cell than in the environment.

The concentration of solute in the environment is different from the concentration inside the cell.

Cells dispose of large waste molecules through a process called(1 point)
Responses

osmosis.
osmosis.

exocytosis.
exocytosis.

diffusion.
diffusion.

endocytosis.

A cell is dropped into a saltwater solution and shrivels up. You infer that, compared to the cell, the type of saltwater solution is(1 point)
Responses

hypotonic.
hypotonic.

hypertonic.
hypertonic.

tonic.
tonic.

isotonic.
isotonic.

Answer 1

Here are the correct responses to each question:

1. What defines osmosis?

   • Response: the movement of water across a semipermeable membrane down a concentration gradient from high to low, using no energy.

2. What is active transport?

   • Response: the movement of molecules up a concentration gradient from low to high, using energy.

3. What does it mean for an environment to be isotonic?

   • Response: The concentration of solute in the environment and the concentration inside the cell are at equilibrium.

4. Cells dispose of large waste molecules through a process called:

   • Response: exocytosis.

5. A cell is dropped into a saltwater solution and shrivels up. You infer that, compared to the cell, the type of saltwater solution is:

   • Response: hypertonic.

Let me know if you have any more questions!