How many carbon atoms are present in ribose?
Ribose is a pentose sugar, meaning it has five carbon atoms in its structure.
Ref: NCERT Class 12 Chemistry > Chapter 14: Biomolecules > Topic: Carbohydrates - Monosaccharides - Structure and Properties
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What is the total number of hydroxyl groups in the open chain form of ribose?
Ribose, a pentose, has four -OH groups in its open chain form (at C2, C3, C4, and C5), as C1 is part of the aldehyde group.
Ref: NCERT Class 12 Chemistry > Chapter 14: Biomolecules > Topic: Carbohydrates - Monosaccharides - Structure and Properties
Which nucleic acid contains a sugar with a missing hydroxyl group at C2?
DNA contains deoxyribose, which lacks an -OH group at C2, unlike ribose in RNA.
Ref: NCERT Class 12 Chemistry > Chapter 14: Biomolecules > Topic: Nucleic Acids - Structure - Nucleotides, Sugars and Base Pairing
Which monosaccharide is found in RNA?
Ribose, a five-carbon sugar, is the monosaccharide component of RNA nucleotides.
Ref: NCERT Class 12 Chemistry > Chapter 14: Biomolecules > Topic: Nucleic Acids - Structure - Nucleotides, Sugars and Base Pairing
Which sugar is a component of RNA but NOT DNA?
Ribose is found in RNA, while deoxyribose is found in DNA. The absence of an oxygen atom in deoxyribose differentiates it from ribose.
Ref: NCERT Class 11 Biology Chapter 9: Biomolecules Nucleic Acids - DNA RNA Structure and Functions
The sugar in RNA is:
β-D-Ribose is the scientifically accurate answer to this question. Within the study of Nucleic Acid, this concept is well-established through extensive research and is documented in standard scientific literature. The specific properties, mechanisms, or characteristics of β-D-Ribose directly address what is being asked. Among the other options, α-D-Ribose, α-D-Deoxyribose, and β-D-Deoxyribose 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: Campbell Biology, Urry et al., 12th Ed.
Which sugar is a precursor in nucleotide synthesis?
Structural role in extracellular matrix is the correct answer because it serves as the specific precursor, synthetic product, or metabolic intermediate described in this question. Biosynthetic pathways in Carbohydrates follow precise enzymatic steps where specific substrates are converted to products through regulated metabolic reactions. Structural role in extracellular matrix occupies a key position in this metabolic pathway due to its chemical structure and reactivity. The other options (Energy storage, Formation of peptide bonds, and Regulation of lipid metabolism) are involved in different biosynthetic routes, serve as precursors for different end products, or participate in unrelated metabolic conversions.
Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 7
The sugar moiety in DNA differs from that in RNA by:
Absence of an oxygen at C-2 in DNA 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 Absence of an oxygen at C-2 in DNA directly address what is being asked. Among the other options, Presence of an extra oxygen in DNA, Presence of an amino group in RNA, and Presence of sulfation in DNA 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