Which disaccharide is a reducing sugar?
Lactose is a reducing sugar because it has a free anomeric carbon on the glucose unit.
Ref: NCERT Class 12 Chemistry > Chapter 14: Biomolecules > Topic: Carbohydrates - Disaccharides and Glycosidic Linkage
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Which of the following is a reducing disaccharide?
Maltose is a reducing disaccharide because it has a free anomeric carbon on one glucose unit.
Ref: NCERT Class 12 Chemistry > Chapter 14: Biomolecules > Topic: Carbohydrates - Disaccharides and Glycosidic Linkage
Which monosaccharide gives a positive Fehling’s test?
Galactose, an aldohexose with a free aldehyde group, reduces Cu²⁺ in Fehling’s solution, producing a red precipitate.
Ref: NCERT Class 12 Chemistry > Chapter 14: Biomolecules > Topic: Carbohydrates - Disaccharides and Glycosidic Linkage
Which monosaccharide reacts with Benedict’s solution to give a red precipitate?
Glucose, a reducing sugar with a free aldehyde group, reduces Cu²⁺ in Benedict’s solution to form a red Cu₂O precipitate.
Ref: NCERT Class 12 Chemistry > Chapter 14: Biomolecules > Topic: Carbohydrates - Monosaccharides - Structure and Properties
Which of the following is an example of a reducing sugar?
Glucose is a reducing sugar as it has a free aldehyde or ketone group that can donate electrons.
Ref: NCERT Class 11 Biology Chapter 9: Biomolecules Proteins and Polysaccharides - Structure and Functions
What is the role of Benedict’s solution in carbohydrate analysis?
Detects reducing sugars accurately defines or describes the concept asked in this question. Within Carbohydrates, precise definitions and terminology are essential for clear scientific communication. The other options (Identifies the presence of polysaccharides, Confirms the presence of glycosidic bonds, and Distinguishes between aldoses and ketoses) either describe related but distinct concepts, use incorrect terminology, or confuse similar-sounding terms that have different scientific meanings. A thorough understanding of exact definitions helps distinguish between closely related biological concepts and is crucial for competitive examinations.
Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 7
Which reagent is used to test for reducing sugars?
Benedict’s solution is the scientifically accurate answer to this question. Within the study of Carbohydrates, this concept is well-established through extensive research and is documented in standard scientific literature. The specific properties, mechanisms, or characteristics of Benedict’s solution directly address what is being asked. Among the other options, Biuret reagent, Iodine solution, and Sudan III do not correctly answer this question because they either refer to different concepts, describe properties of other molecules or processes, or represent common misconceptions about this topic.
Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 7
Reducing sugars are least suited for long-distance transport because they are:
Answer: B) Plastids. For PSS- Sec-F-Transport, remember the key idea and you’ll land on this option; the distractors usually swap cause and effect or confuse similar terms. Avoid: A) Mitochondria; C) Peroxisomes; D) Cytosol. Name the process first, then pick the option that describes it — don’t reverse cause and effect.
Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.