11 public questions tagged with this topic.
Vitamin B3 (Niacin) is a key component of NAD (Nicotinamide Adenine Dinucleotide). This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.
Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Biology - Zoology portion covering relevant system and function.
NAD (Nicotinamide Adenine Dinucleotide) is a coenzyme that plays a key role in redox reactions. This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.
Ref: NCERT Biology Textbook - Latest Edition for Academic Session 2026-27 (Zoology section, Rationalized Textbook for Class XI and XII), Chapter: Biology - Zoology portion (Latest NCERT Textbooks for Academic Session 2026-27 - Rationalized Edition for Class XI and XII), Topic: Structural organization, physiology, human health and related concepts as per latest syllabus.
Vitamin B₁ (Thiamine) is a precursor to TPP, a coenzyme in decarboxylation reactions.
Ref: NCERT Class 12 Chemistry > Chapter 14: Biomolecules > Topic: Vitamins - Types, Coenzymes and Deficiency Diseases - Part 1
Vitamin B₆ (Pyridoxine), as pyridoxal phosphate (PLP), is a coenzyme in transamination, aiding amino acid metabolism.
Ref: NCERT Class 12 Chemistry > Chapter 14: Biomolecules > Topic: Vitamins - Types, Coenzymes and Deficiency Diseases - Part 1
Vitamin B₂ (Riboflavin) is a precursor to flavin adenine dinucleotide (FAD), a coenzyme in redox reactions.
Ref: NCERT Class 12 Chemistry > Chapter 14: Biomolecules > Topic: Vitamins - Types, Coenzymes and Deficiency Diseases - Part 1
Vitamin B₃ (Niacin) is converted into nicotinamide, a component of NAD+, a coenzyme in redox reactions.
Ref: NCERT Class 12 Chemistry > Chapter 14: Biomolecules > Topic: Vitamins - Types, Coenzymes and Deficiency Diseases - Part 1
Not all enzymes require cofactors to function; some enzymes work independently.
Ref: NCERT Class 11 Biology Chapter 9: Biomolecules Enzymes - Properties Classification and Cofactors
Coenzymes are often loosely bound to enzymes and can be reused; they are not always permanently attached.
Ref: NCERT Class 11 Biology Chapter 9: Biomolecules Enzymes - Properties Classification and Cofactors
Coenzymes are often loosely bound to enzymes and can be reused; they are not always permanently attached.
Ref: NCERT Class 11 Biology Chapter 9: Biomolecules Enzymes - Properties Classification and Cofactors
Vitamin is the accurate answer because it correctly identifies the biological function or role described in this question. In Atoms and Molecules, understanding the specific functions of molecules, enzymes, or structures is fundamental. Vitamin fulfills this particular biological role through its specific structural properties, biochemical activity, or physiological mechanism. The other options (Nucleic acid, Lipid, and Carbohydrate) serve different biological functions or are associated with other processes, pathways, or structural roles within the cell or organism.
Ref: Campbell Biology, Urry et al., 12th Ed.
Nicotinamide adenine dinucleotide is the correct answer because it serves as the specific precursor, synthetic product, or metabolic intermediate described in this question. Biosynthetic pathways in Enzymes Basics follow precise enzymatic steps where specific substrates are converted to products through regulated metabolic reactions. Nicotinamide adenine dinucleotide occupies a key position in this metabolic pathway due to its chemical structure and reactivity. The other options (Thiamine pyrophosphate, Flavin adenine dinucleotide, and Pyridoxal phosphate) 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. 6
