1.3.2 Disaccharides

• What type of reaction forms a glycosidic bond?

  Condensation
• Sucrose is composed of glucose and fructose
• Where is sucrose commonly found?

  Table sugar
• The condensation reaction releases a water molecule.
• $Glucose +$$Glucose \rightarrow Maltose +$$H_{2}O$ represents the formation of maltose
• What two monosaccharides make up sucrose?

  Glucose + Fructose
• What molecule is eliminated during the formation of a disaccharide?

  $H_{2}O$
• Maltose is composed of two glucose molecules.
• In what food is maltose commonly found?

  Brewing of beer
• The equation Glucose + Glucose \rightarrow Maltose + H_{2}O</latex> represents a condensation reaction.
• Match the disaccharide with its composition:

  Maltose ↔️ Glucose + Glucose

  Sucrose ↔️ Glucose + Fructose

  Lactose ↔️ Glucose + Galactose
• Maltose is composed of glucose and glucose
• Which disaccharide is formed from glucose and fructose?

  Sucrose
• Lactose is composed of glucose and galactose
• Disaccharides are formed through a condensation reaction between two monosaccharides.
• What type of bond links two monosaccharides in a disaccharide?

  Glycosidic bond
• Match the type of glycosidic bond with its example:

  $\alpha$-Glycosidic ↔️ Maltose

  $\beta$-Glycosidic ↔️ Lactose
• What monosaccharides make up sucrose?

  Glucose and Fructose
• Sucrose is formed by an $\alpha(1 \rightarrow 2)$ glycosidic bond
• Sucrose is a non-reducing sugar because it lacks aldehyde or ketone groups.
• What molecule is eliminated during the formation of a glycosidic bond in disaccharides?

  $H_{2}O$
• In which food is lactose commonly found?

  Milk
• Maltose is composed of glucose and glucose
• A glycosidic bond is formed through a condensation reaction.
• What are the two main types of glycosidic bonds?

  $\alpha$ and $\beta$
• Match the type of glycosidic bond with its example:

  $\alpha$-Glycosidic ↔️ Maltose

  $\beta$-Glycosidic ↔️ Lactose
• What type of bond links two monosaccharides together?

  Glycosidic bond
• Glycosidic bonds form through a condensation reaction, eliminating a water molecule.
• There are two main types of glycosidic bonds: \alpha and $\beta$ bonds.
• What is an example of a disaccharide formed by an $\alpha$-glycosidic bond?


  Maltose
• Lactose is an example of a disaccharide formed by a $\beta$-glycosidic bond.
• Sucrose is composed of glucose and fructose linked by an $\alpha(1 \rightarrow 2)$ glycosidic bond.
• Why is sucrose classified as a non-reducing sugar?

  No free aldehyde group
• Match the disaccharide with its monosaccharide composition and glycosidic bond type:

  Lactose ↔️ Glucose + Galactose, $\beta(1 \rightarrow 4)$

  Maltose ↔️ Glucose + Glucose, $\alpha(1 \rightarrow 4)$

  Sucrose ↔️ Glucose + Fructose, $\alpha(1 \rightarrow 2)$
• Lactose is a reducing sugar due to the presence of a free aldehyde group.
• Maltose is formed by two glucose molecules linked by an $\alpha(1 \rightarrow 4)$ glycosidic bond.
• What property of maltose allows it to reduce certain metal ions in solution?

  Free aldehyde group
• What type of glycosidic bond links two glucose molecules in maltose?

  $\alpha(1 \rightarrow 4)$
• Maltose is a reducing sugar due to the presence of a free aldehyde group.
• Maltose is composed of two glucose molecules linked by an $\alpha(1 \rightarrow 4)$ glycosidic bond