Which of the following is a disaccharide?
Maltose is a disaccharide composed of two glucose molecules.
Ref: NCERT Class 11 Biology Chapter 9: Biomolecules Enzyme Action and Factors Affecting Enzyme Activity
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Which of the following elements is a major component of nucleic acids but is not found in carbohydrates?
Nitrogen is a key component of nucleic acids (DNA & RNA) but is absent in carbohydrates.
Ref: NCERT Class 11 Biology Chapter 9: Biomolecules Nucleic Acids - DNA RNA Structure and Functions
Which of the following statements about carbohydrates is incorrect?
Sucrose is a disaccharide composed of glucose and fructose, not a polymer of glucose.
Ref: NCERT Class 11 Biology Chapter 9: Biomolecules Proteins and Polysaccharides - Structure and Functions
Which of the following statements about carbohydrates is correct?
Cellulose provides structural support in plants. Glycogen is found in animals, starch is made of glucose, and chitin is found in fungi and arthropods.
Ref: NCERT Class 11 Biology Chapter 9: Biomolecules Proteins and Polysaccharides - Structure and Functions
Which of the following statements about polysaccharides is correct?
Starch (plants) and glycogen (animals) are storage polysaccharides. Chitin is structural, and humans cannot digest cellulose.
Ref: NCERT Class 11 Biology Chapter 9: Biomolecules Proteins and Polysaccharides - Structure and Functions
Which of the following statements about carbohydrates is correct?
Monosaccharides are the basic building blocks of carbohydrates. Starch and glycogen are storage, not structural, polysaccharides.
Ref: NCERT Class 11 Biology Chapter 9: Biomolecules Proteins and Polysaccharides - Structure and Functions
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
Which of the following statements about carbohydrates is correct?
Carbohydrates serve as an energy source. Cellulose is structural, not a storage carbohydrate, and starch is a polymer of glucose, not ribose.
Ref: NCERT Class 11 Biology Chapter 9: Biomolecules Proteins and Polysaccharides - Structure and Functions
Which of the following is a reducing sugar?
Glucose is a reducing sugar because it has a free aldehyde or ketone group capable of donating electrons.
Ref: NCERT Class 11 Biology Chapter 9: Biomolecules Proteins and Polysaccharides - Structure and Functions
Which biomolecule serves as the primary energy source in most organisms?
Carbohydrates serve as the primary energy source for most organisms, providing immediate energy through glucose metabolism.
Ref: NCERT Class 11 Biology Chapter 9: Biomolecules Chemical Analysis and Biomolecules - Amino Acids Lipids
Which of the following statements about carbohydrates is incorrect?
Carbohydrates are composed of sugar units, not amino acids.
Ref: NCERT Class 11 Biology Chapter 9: Biomolecules Chemical Analysis and Biomolecules - Amino Acids Lipids
In Fischer projection, D and L configurations are based on:
The orientation of the hydroxyl (-OH) group at the penultimate carbon 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 The orientation of the hydroxyl (-OH) group at the penultimate carbon directly address what is being asked. Among the other options, The rotation of plane-polarized light, The presence of an aldehyde or ketone group, and The number of chiral centers in the molecule 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