The letter 'D' in D-glucose signifies

• configuration at all chiral carbons

• dextrorotatory

• that it is a monosaccharide

• configuration at a particular chiral carbon

In alkaline medium, alanine exists predominantly as

• anion

• Zwitter ion

• cation

• Covalent form

443.

α-maltose consists of

• one α-D-glucopyranose unit and one β-D-glucopyranose unit with 1-2 glycosidic linkage.

• two α-D-glucopyranose units with 1-2 glycosidic linkage

• two β-D-glucopyranose unit with 1-4 glycosidic linkage.

• two α-D-glucopyranose units with 1-4 glycosidic linkage

Which one of the following does not correctly match with each other?

• Silk-polyamide

• Lipase enzyme

• Butter fat

• oxytocin-enzyme

Glucose when reduced with HI and red phosphorus gives

• n-hexane

• n-heptane

• n-pentane

• n-octane

Oils are liquids at room temperature since they contain higher percentage of

• oleates

• palmitates

• stearates

• myristates

The number of disulphide linkages present in insulin are

• 4

• 3

• 2

• 1

A given sample of milk turns sour at room temperature (27°C) in 5 h. In a refrigerator at - 3°C, it can be stored 10 times longer. The energy of activation for the souring of milk is

• 2.303 × 5 R kJ mol^-1

• 2.303 × 3 R kJ mol^-1

• 2.303 × 2.7 R kJ mol^-1

• 2.303 × 10 R kJ mol^-1

Sucrose is not a reducing sugar since

• it contains no free aldehyde or keto group adjacent to, -CHOH group

• it is built up of a fructose unit

• it is optically active

• it is chemically stable

Dialysis can be used to separate

• protein and starch

• glucose and protein

• glucose and NaCl

• glucose and fructose