Question

Test Tube 1 - Milk (Lactose): Demetri fills the first test tube one-quarter full of milk. Then, he slowly adds water to the milk until the test tube is three-quarters full. Using the stirrer, Demetri thoroughly mixes the solution. Then he inserts the test strip for 30 seconds and records its color.



Test Tube 2 - Milk (Lactose) and Lactase Enzyme: Demetri fills the second test tube one-quarter full with milk. He then adds the lactase-and-water solution until the test tube is three-quarters full. He uses a stirrer to thoroughly mix the solution. Next, Demetri inserts the test strip for 30 seconds and records its color.



Test Tube 3 - Milk (Lactose) and Heated Lactase Enzyme: Demetri fills the third test tube one-quarter full with milk. He then adds the heated lactase-and-water solution until the test tube is three-quarters full. After stirring, Demetri inserts the test strip for 30 seconds and records its color.



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

Answer 1

Answer:

2nd test tube.

Explanation:

cause lactase will break down lactose into glucose and galactose.

In first test tube there is no such activity due to absence of lactase and in 3rd test tube as the enzyme is heated so it is get denatured so in this case also there is no activity of lactase enzyme.

Answer 2

Answer:  2nd test tube.

Explanation: cause lactase will break down lactose into glucose and galactose.

In first test tube there is no such activity due to absence of lactase and in 3rd test tube as the enzyme is heated so it is get denatured so in this case also there is no activity of lactase enzyme.