Which macromolecules were present in each sample?
substance: color after iodine test color after copper (ii) sulfate and sodium-hydroxide test
water: brown blue
potato: dark blue/black blue
egg white: brown purple
milk: brown purple
unknown: brown purple

Axon, also called nerve fibre, portion of a nerve cell (neuron) that carries nerve impulses away from the cell body. A neuron typically has one axon that connects it with other neurons or with muscle or gland cells. Some axons may be quite long, reaching, for example, from the spinal cord down to a toe.

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