Final answer:
When a glucose strip is put in regular milk, it typically does not react because milk contains lactose, not glucose. However, if enzymes like lactase are added, they can break down lactose into glucose, which a glucose test strip can then detect. Lactose-free milk might show glucose without enzyme treatment since lactose is often already converted into glucose and galactose.
Step-by-step explanation:
If you put a glucose strip in milk, depending on the type of milk, you might observe different results. Regular milk contains lactose, which is not glucose, so it is expected that a glucose test strip would not react and, hence, not show a higher level of glucose (“c) It will not react”). However, if enzymes like lactase are introduced into the milk, they would break down the lactose into glucose and galactose, which means that testing with a glucose strip after this reaction should show a higher glucose level. Lactose-free milk may show a higher glucose level than regular milk even before enzyme treatment since it typically has lactose already converted into glucose and galactose. These results are also dependent on the specificities of the glucose testing strip. Some glucose testing strips use glucose oxidase for the reaction, but these strips might not react accurately with lactose and therefore would not show a change in glucose levels when used in regular milk.
Modern electronic gadgets for the estimation of blood glucose are usually based on a glucose oxidase-colorimetric reaction. When a glucose test strip is used, the intensity of the developed color is directly proportional to the amount of glucose in the sample. Hence, if a solution other than blood with traceable amounts of glucose is used, like lactose-free milk, the strip could potentially give an indication of the glucose level.