Question

part 2: d: you are trying to identify an unlabeled container of yellowish jelly - like substance from your refrigerator. it is either an aspic (jello type stuff made from gelatin which is solid protein), or a fruit chutney (contains reducing sugar and starch), or a meat glaze (contains protein and starch). you test the substance with some of the tests you learned in the lab, and the results are shown below. fill in the blanks in the table and identify the substance. test used result observed explain the result benedicts turned red select iodine turned black select biuret remained blue proteins present disaccharides present starch present monosaccharides present the substance is select question 8 1 pts part 2: lactose is a disaccharide made from the two monosaccharides glucose and galactose. which of the following best represents a molecule of lactose?

Explanation:

Step1: Analyze Benedict's test result

Benedict's test turns red in the presence of reducing sugars (monosaccharides or some disaccharides). So the explanation for the Benedict's test result of "Turned Red" is "monosaccharides present".

Step2: Analyze iodine test result

Iodine turns black in the presence of starch. So the explanation for the iodine test result of "turned black" is "starch present".

Step3: Analyze Biuret test result

Biuret test remains blue in the absence of proteins. Since it remained blue, there are no proteins present.

Step4: Identify the substance

The substance has reducing sugar (from Benedict's test) and starch (from iodine test) and no protein (from Biuret test). So it is a fruit chutney.

Answer:

For the Benedict's test - monosaccharides present; For the iodine test - starch present; For the Biuret test - no proteins present; The substance is a fruit chutney.

For the second - part about lactose:
Lactose is a disaccharide made up of two monosaccharides (glucose and galactose). A single - hexagon represents a monosaccharide. Two hexagons joined represent a disaccharide. So the answer is the structure with two hexagons joined (assuming B is the structure with two hexagons joined).