Question

complete the sentences using the words provided.

1. in a phospholipid molecule, (click to select) usually binds to a charged organic molecule, such as choline or the amino acid serine.
2. in a phospholipid molecule, (click to select) binds to two fatty acids.
3. in a phospholipid molecule, the \head\ is (click to select) .
4. in a phospholipid molecule, the fatty acid \tails\ are (click to select) .
5. when phospholipid molecules are mixed with water, they can spontaneously organize into a bilayer with the \tails\ located (click to select) of the bilayer.
6. when phospholipid molecules are mixed with water, they can spontaneously organize into a bilayer with the \heads\ located (click to select) of the bilayer.
7. lipid bilayers form the basic framework of (click to select) .

Explanation:

These sentences describe the structure and behavior of phospholipids, which are key components of cell membranes. The answers are based on core biological knowledge of phospholipid structure and membrane formation.

1. The phosphate group in phospholipids links to charged organic molecules.
2. Glycerol forms the backbone connecting fatty acids.
3. Phospholipid heads interact with water, making them hydrophilic.
4. Fatty acid tails avoid water, making them hydrophobic.
5. Hydrophobic tails cluster in the bilayer's interior.
6. Hydrophilic heads face outward toward water.
7. Lipid bilayers are the main structure of cell membranes.

Answer:

1. phosphate group
2. glycerol
3. hydrophilic
4. hydrophobic
5. in the interior
6. on the surface
7. cell membranes