Phospholipids are esters of glycerol with

• one carboxylic acid residue and two phosphate groups

• three phosphate groups

• three carboxylic acid residues

• two carboxylic acid residues and one phosphate groups

Which one of the following structures represents the peptide chain ?

A sequence of how many nucleotides in messenger RNA makes a codon for an amino acid?

• Three

• Four

• One

• Two

Which functional group participates in disulphide bond formation in proteins ?

• Thiolacetone

• Thiol

• Thioether

• Thioester

195.

The safest and the most commone alternative of sugar is

• glucose

• aspartame

• saccharin

• cyclodextrin

The enzymes which are used to convert starch into ethyl alcohol are :

• maltase, diastase

• diastase, maltase, zymase

• invertase, zymase

• invertase, diastase, maltase

Glucose is a/an:

• polyhydroxy ketone

• alcohol

• hydrate of carbon

• pentahydroxy aldehyde

A Zwitter ion is

• a negatively charged ion without metal atom

• a heavy ion with a small charge on it

• an ion with positive and negative charge at different points on it

• a positively charged ion without a metal atom

Mutarotation is not exhibited by

• sucrose

• glucose

• maltose

• fructose

Which of the following classes of compounds do glucose and fructose represent?

• Aldoses and ketoses, respectively

• Polyols

• Monosaccharides

• All of these