Which statement best describes most vitamins?

Which statement best describes most vitamins?

• A. are precursors to coenzymes
• B. are synthesized by humans
• C. consist of amino acids, fatty acids or sugars
• D. are covalently linked to proteins without modification

Answer: (C)

Vitamins are small organic micronutrients required in tiny amounts and often act as cofactors after activation. A useful way to think about their chemistry is that they are simple molecules derived from basic metabolic building blocks, including components related to amino acids, sugars, and fatty acids. This emphasizes that vitamins are small, diverse molecules rather than large polymers or protein components, and they can originate from these fundamental units through biosynthetic pathways. That broad characterization makes the statement describing vitamins as consisting of amino acids, fatty acids, or sugars the best fit among the options. In contrast, not all vitamins serve strictly as precursors to coenzymes, many cannot be synthesized by humans in adequate amounts and must be obtained from the diet, and vitamins are not covalently bound to proteins in their active forms.

Vitamins are small organic micronutrients required in tiny amounts and often act as cofactors after activation. A useful way to think about their chemistry is that they are simple molecules derived from basic metabolic building blocks, including components related to amino acids, sugars, and fatty acids. This emphasizes that vitamins are small, diverse molecules rather than large polymers or protein components, and they can originate from these fundamental units through biosynthetic pathways. That broad characterization makes the statement describing vitamins as consisting of amino acids, fatty acids, or sugars the best fit among the options.

In contrast, not all vitamins serve strictly as precursors to coenzymes, many cannot be synthesized by humans in adequate amounts and must be obtained from the diet, and vitamins are not covalently bound to proteins in their active forms.