Question

read the scenario. scientists are studying compounds in a newly discovered rain forest plant. the plant produces an unusual substance that local people say acts as an anesthetic. a scientist tests the substance using iodine, a brown solution. when the iodine indicator is added, the color changes from brown to a dark blue color. which macromolecule is present? lipid enzyme starch protein

Explanation:

Iodine is a common indicator for starch. When iodine reacts with starch, it forms a complex that results in a dark - blue color change. Lipids, enzymes, and proteins do not produce this color change with iodine.

Answer:

starch