Chemistry - Biomolecules

Question - 1

The changes in the optical rotation of freshly prepared solution of glucose is known as

  • A Tautomerism
  • B racemisation
  • C Specific rotation
  • D mutarotation

Question - 2

Amylopectin is a polymer of

  • A \(\alpha \)-D-glucose
  • B \(\alpha \)-D-fructose
  • C Lactose 
  • D amylose

Question - 3

The term anomers of glucode refers to

  • A isomers of glucose that differ in configuration at carbons one and four (C-1 and C-4)
  • B a mixture of D-glucose and L- glucose
  • C enantiomers of glucose
  • D isomers of glucose that differ in configuration at carbon one c-1

Question - 4

Methyl \(\alpha \)-D-glucoside and methyl-\(\beta \)-D-glucoside are 

  • A epimers 
  • B anormers
  • C enantiomers
  • D conformational diastereomers

Question - 5

Number of chiral carbon atoms in \(\beta \)-D-(+)-glucose is 

  • A five
  • B six
  • C three
  • D four

Question - 6

Glycose is a branced chain polymer of \(\alpha \)-D-glucose units in which chain is formed by \({ C }_{ 1 }-{ C }_{ 6 }\) glycoside linkage.  Structure of glycogen is similar to

  • A amylose 
  • B amylopectin
  • C cellulose
  • D glycogen

Question - 7

which of the following is an example of ketohexose?

  • A Mannose 
  • B Galactose
  • C Maltose
  • D Fructose

Question - 8

Which one of the following does not reduce Fehling's solution?

  • A Benzaldehyde
  • B Formic acid
  • C Glucose 
  • D Fructose

Question - 9

Surcose (cane sugar) is a disaccharide. One molecule of sucrose on hydrolysis gives.........

  • A 2 molecules of glucose
  • B 2 molecules of glucose+1 molecule of fructose
  • C 1 molecule of glucose+ 1 molecule of fructose
  • D 2 molecules of fructose

Question - 10

A compound give negative test with ninhydrin and positive test with Benedict's solution.  The compound is

  • A a protein
  • B an amino acid
  • C a lipid
  • D a monosaccharide
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