Question

which sample contains no macromolecules at all? you can also click the view image button to display the test results in the labpad.
a) bread
b) water
c) vegetable oil
d) apple

Explanation:

Macromolecules are large molecules (e.g., carbohydrates, lipids, proteins, nucleic acids). Bread has carbohydrates (e.g., starch), apple has carbohydrates/proteins, vegetable oil has lipids (a type of macromolecule). Water ($H_2O$) is a small molecule, not a macromolecule, so it contains no macromolecules.

Answer:

b) Water