NURSING ANM AND GNM

NURSING EXAM QUESTIONS

BIOCHEMISTRY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What is reducing sugar?
A
A reaction of monosaccharides
B
An oligosaccharide
C
A function of polysaccharides
D
A chemical property
Explanation: 

Detailed explanation-1: -All monosaccharides are reducing sugars because all monosaccharides have an aldehyde group (if they are aldoses) or can tautomerize in solution to form an aldehyde group (if they are ketoses). This includes common monosaccharides like galactose, glucose, glyceraldehyde, fructose, ribose, and xylose.

Detailed explanation-2: -A reducing sugar is any sugar that is capable of acting as a reducing agent. In an alkaline solution, a reducing sugar forms some aldehyde or ketone, which allows it to act as a reducing agent, for example in Benedict’s reagent. In such a reaction, the sugar becomes a carboxylic acid.

Detailed explanation-3: -As polyols with carbonyls, monosaccharides can undergo a series of oxidation and reduction reactions. Reduction of a monosaccharides produces polyols known as alditols or sugar alcohols.

Detailed explanation-4: -Yes. All monosaccharides are reducing sugars. Glucose, fructose, and galactose are monosaccharides and are all reducing sugars.

Detailed explanation-5: -An important reaction of monosaccharides is the oxidation of the aldehyde group, one of the most easily oxidized organic functional groups. Aldehyde oxidation can be accomplished with any mild oxidizing agent, such as Tollens’ reagent or Benedict’s reagent.

There is 1 question to complete.