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Charra [1.4K]
3 years ago
5

This macromolecule forms pumps and channels within the cell membrane. They act like to let molecules in and out of the cell.

Biology
1 answer:
Ilya [14]3 years ago
3 0

Answer:

The macromolecules that forms pumps and channels in the cell membrane, allowing the entry and exit of molecules to the cell are protein.

Explanation:

Membrane integral proteins are a type of macromolecule attached to the structure of the membrane and have ends in contact with the cytoplasm and the extracellular medium.

These <u>protein molecules can act as channels and transporters or pumps</u>, to facilitate the passage of substances through the membrane. An example of transmembrane channels are ion channels, while a protein transporter is the sodium potassium ATP-ase pump.

Membrane proteins can also act as surface receptors and enzymes linked to the cell membrane.

The other options are not correct because :

  • <em><u>Carbohydrates</u></em><em> can be found on the membrane bound to other molecules, such as glycoproteins and glycolipids, but they do not act as pumps or channels. </em>
  • <em><u>Lipids</u></em><em> have the function of being the main component of the cell membranes. </em>
  • <em><u>Nucleic acids</u></em><em> are found in the nucleus, and are not part of the cell membrane.</em>
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