Question

refer to the passage. the results of the experiment most strongly support which conclusion about the polarity of lipid molecules? a teacher assigns the following experiment to a class. draw an outline of a birds feather, and color one half of the outline with a thick coat of wax from a wax crayon. leave the other half uncolored. next, sprinkle a few drops of water on both halves of the feather. you will observe that the water soaks into the plain paper. the waxy coat, however, allows the paper to remain dry. water forms tiny beads on top of the wax instead of soaking through it. lipid molecules are polar because they mix poorly with liquids, such as water. lipid molecules are polar because they adhere tightly to smooth surfaces, such as paper. lipid molecules are non - polar because they repel water molecules, which also are non - polar. lipid molecules are non - polar because they repel water molecules, which are polar.

Explanation:

Water is a polar molecule. In the experiment, water beads up on the wax - coated half, showing that the wax (which contains lipids) repels water. Non - polar substances tend to repel polar substances like water. This indicates that lipid molecules are non - polar.

Answer:

D. Lipid molecules are non - polar because they repel water molecules, which are polar.