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Common Monosaccharides quiz

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  • What are the two main categories of common monosaccharides based on their functional groups?
    Monosaccharides are categorized as aldoses (with an aldehyde group) and ketoses (with a ketone group).
  • Which six D-monosaccharides are most commonly recommended for memorization?
    D glucose, D mannose, D galactose, D ribose, D deoxyribose, and D fructose are the six most commonly recommended monosaccharides.
  • What is the functional group and carbon count of D-glucose?
    D-glucose is an aldohexose, meaning it has an aldehyde group and six carbon atoms.
  • How can you distinguish D-mannose from D-glucose structurally?
    D-mannose is the C2 epimer of D-glucose, differing only at the C2 carbon's hydroxyl group.
  • What mnemonic helps remember that D-galactose is the C4 epimer of glucose?
    The four vowels in 'galactose' and the galactic theme (C4 as an explosive) help remember it is the C4 epimer of glucose.
  • What is the key structural difference between D-fructose and D-glucose?
    D-fructose is a ketohexose, with a ketone group at C2 instead of the aldehyde group at C1 in D-glucose.
  • How does D-ribose differ from D-deoxyribose?
    D-deoxyribose has one less oxygen atom than D-ribose, specifically missing the oxygen at the C2 position.
  • What is the pattern of hydroxyl groups in D-glucose's linear form?
    In D-glucose, the hydroxyl groups are right (C2), left (C3), right (C4), and right (C5).
  • How are the carbon atoms numbered in monosaccharides?
    The carbon atom in the functional group (aldehyde or ketone) is assigned the lowest possible number, and numbering proceeds sequentially from top to bottom.
  • What is the 'up, lefting, and down right' mnemonic used for?
    It helps convert linear Fisher projections to cyclic Haworth projections: groups on the left point up, and groups on the right point down.
  • How is the anomeric carbon identified in Haworth projections?
    The anomeric carbon is the carbon furthest to the right in the Haworth projection and is assigned the lowest possible number.
  • What determines whether a cyclic monosaccharide is alpha or beta?
    The configuration of the anomeric carbon's hydroxyl group: alpha points down, beta points up.
  • What is the key feature of D-ribose's structure in its linear form?
    All hydroxyl groups on D-ribose's chiral carbons point to the right.
  • How is D-fructose derived from D-glucose?
    D-fructose is derived by converting the aldehyde group of D-glucose to a ketone group at C2.
  • Why is memorizing D-glucose's structure important for learning other hexoses?
    D-glucose serves as a reference for memorizing the structures of other hexoses, such as D-mannose and D-galactose, which are its epimers.