Ask a New Question
Menu

A scientist is studying a new protist species that is a type of single-celled eukaryote. Using both microscope and biochemical techniques, they have determined the following movements across the cells membrane:

Biomolecule Movement #1:

Lactose moves through a channel protein in the membrane of the cell from a high concentration on the outside to a low concentration of lactose on the inside.

Biomolecule Movement #2:

Potassium is pumped out of the cell using a membrane protein from a low concentration of potassium on the inside of the cell to a high concentration of potassium on the outside of the cell.

Biomolecule Movement #3:

Oxygen gas moves from a high concentration on the outside of the cell to a low concentration inside the cell. The gas does not appear to need any membrane protein to cross the cell membrane.

Biomolecule Movement #4:

Water moves from a hypotonic environment on the outside of the cell to a hypertonic environment on the inside of the cell through protein channels called aquaporins.



Based on these conclusions, identify the movement of biomolecules that demonstrates both osmosis and facilitated diffusion across a cell membrane.

(1 point)
Responses

Biomolecule Movement #3
Biomolecule Movement #3

Biomolecule Movement #1
Biomolecule Movement #1

Biomolecule Movement #4
Biomolecule Movement #4

Biomolecule Movement #2

1 answer

To identify the movement of biomolecules that demonstrates both osmosis and facilitated diffusion across a cell membrane, let's analyze each movement:

  1. Biomolecule Movement #1 (Lactose movement): This is an example of facilitated diffusion since lactose is moving through a channel protein from high to low concentration.

  2. Biomolecule Movement #2 (Potassium movement): This is an example of active transport, as potassium is being pumped against its concentration gradient using energy.

  3. Biomolecule Movement #3 (Oxygen gas movement): This is an example of simple diffusion, where a gas moves from high to low concentration without the need for any membrane protein.

  4. Biomolecule Movement #4 (Water movement): This is an example of osmosis, as water moves through aquaporin channels from a hypotonic environment to a hypertonic environment. It also involves facilitated diffusion since aquaporins are channel proteins.

Based on this analysis, Biomolecule Movement #4 demonstrates osmosis (water movement) and facilitated diffusion (through aquaporins).

Therefore, the correct response is:

Biomolecule Movement #4.