Identify whether the following sugars are reducing or non-reducing. 1: Galactose ____ 2: Maltose (glucose-glucose) ____ 3: Fructose ____ 4: Glucose ____ 5: Sucrose (glucose-fructose) ____ 6: Lactose (galactose-glucose) ____匹配题

题目图片
A

Reducing

B

Both reducing and non-reducing

C

Non-reducing

D

Neither reducing nor non-reducing

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  In the lab, you are testing an unknown solution using Benedict’s test. After you add Benedict’s reagent, the unknown solution appears yellow. As you write up your lab report, how should you explain this result? This is a negative result, so the unknown must have a free aldehyde or ketone reactive group, and reducing sugar is not present. This is a positive result, so the unknown must have a free aldehyde or ketone reactive group, and reducing sugar is present. This is a positive result, so the unknown must have a free aldehyde or ketone reactive group, so a polysaccharide is present. This is a negative result, so the unknown must have a free aldehyde or ketone reactive group, so a polysaccharide is not present.

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