Question

question 13 of 20 : select the best answer for the question. this is an image of the phospholipid bilayer. what’s the name of the part of the phospholipid that’s between the layers, labeled 2 in the image? (image by openstax (cc by 3.0), via wikimedia commons.) a. hydrophilic head b. sodium - potassium pump c. hydrophobic tail d. atp

Explanation:

To solve this, we analyze the phospholipid bilayer structure:

• A phospholipid has a hydrophilic (water - attracting) head and hydrophobic (water - repelling) tails.
• In the bilayer, the hydrophilic heads (labeled a and b) face the aqueous environments (outside and inside the cell), and the hydrophobic tails are between the layers.
• Option A: Hydrophilic heads are at the surfaces (a and b), not between layers.
• Option B: Sodium - potassium pump is a protein, not part of the phospholipid structure.
• Option C: Hydrophobic tails are the non - polar parts of phospholipids that are sandwiched between the hydrophilic heads, which matches the part labeled 2 (between the layers).
• Option D: ATP is an energy - carrying molecule, not part of the phospholipid.

Answer:

C. Hydrophobic tail