Is sucrose a reducing sugar? Explain why or why not. Is lactose a reducing sugar

Question

Is sucrose a reducing sugar? Explain why or why not. Is lactose a reducing sugar? Explain why or why not. Which of the following does not distinguish glycoproteins and proteoglycans? A. Sugars in glycoproteins are branched while in proteoglycans they are not. B. Sugars in glycoproteins do not have repeating units while in proteoglycans they do. C. Sugars in glycoproteins are attached via serine while in proteoglycans they are not. D. All of these describe differences between the two. E. None of these describe differences between the two. Is the vitamin C below a derived from an L or D hexose? Explain your answer.

Explanation / Answer

Answer:

1. Is sucrose a reducing sugar?

Ans: A reducing sugar contains a free aldehyde or a keto group and can act as a reducing agent (undergoes oxidation) whereas a non reducing sugar does not have a free aldehyde or keto group.

In case of sucrose, there are no free aldehyde or keto groups and lacks a free anomeric carbon therefore, Sucrose is a non reducing sugar.

2. Is lactose a reducing sugar?

Ans: Yes, lactose is a reducing sugar since it contains a free aldehyde group and can act as a reducing agent (undergoes oxidation).

3. Which of the following does not distinguishes glycoproteins and proteoglycans?

Ans (C) sugars in glycoproteins are attached via Serine while in proteoglycans they are not

4. Is the vitamin D below derived from an L or D Hexose?

Ans: D-hexose

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