Test Tube 4 - Sugar (Sucrose): Demetri fills the fourth test tube one-quarter full of sugar. He then adds water to the test tube until it is three-quarters full and stirs until the sugar dissolves. Demetri then inserts the test strip for 30 seconds and records its color.

Test Tube 5 - Sugar (Sucrose) and Lactase Enzyme: Demetri fills the fifth test tube one-quarter full of sugar. He then adds the lactase-and-water solution until the test tube is three-quarters full. He thoroughly mixes the solution and inserts the test strip for 30 seconds. Demetri then records the color of the test strip.
Test Tube 6 - Sugar (Sucrose) and Heated Lactase Enzyme: Demetri fills the sixth test tube one-quarter full of sugar. He then adds the heated lactase-and-water solution until the test tube is three-quarters full. He thoroughly mixes the solution and inserts the test strip for 30 seconds. Demetri then records the color of the test strip.

According to the test strips, which of these sugar solutions contained glucose?

A test strip is a strip made up of cloth or different types of paper. The strips are used in chemical and biological tests, they turn or change their color, and identify the substance.

Here, the test strip will not show any color, because glucose is not present in any of the solutions as mentioned.

Thus, the glucose strips did not change color when placed in the sugar, and none of the sugar solutions contained glucose.

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