Question

which contains phosphorus and nitrogen atoms, is polar and dissolves in water. substances that mix with water are called hydrophilic, or water - loving. the fatty acid tails are nonpolar. nonpolar molecules do not mix with water. so the nonpolar tails in a phospholipid are hydrophobic, or water - fearing. molecules that have both a hydrophilic and a hydrophobic region are called amphipathic. the model shows a simplified representation of a phospholipid and its chemical structure. (the simplified representation does not show glycerol.) complete the sentence. a phospholipid is amphipathic because its dropdown polar and hydrophilic, and its dropdown nonpolar and hydrophobic.

Explanation:

From the text, we know that molecules with a hydrophilic (polar, water - loving) and a hydrophobic (nonpolar, water - fearing) region are amphipathic. The text and diagram show that the phosphate group (head) is polar and hydrophilic, and the fatty acid tails are nonpolar and hydrophobic. So a phospholipid is amphipathic because its phosphate group (head) is polar and hydrophilic, and its fatty acid tails are nonpolar and hydrophobic.

Answer:

First blank: phosphate group (head)
Second blank: fatty acid tails