Chemistry : Biomolecules

Vitamin B₁₂ contains :

• Co

• Mn

• Mg

• Fe

Which one of the following structures represents the peptide chain ?

The deficiency of iodine in diet causes :

• rickets

• nightblindness

• beri-beri

• goiter

Proteins are :

• polypeptides with low molecular weights

• polypeptides with high molecular weights

• polymers of amides

• polymers of secondary amines

Among the following, the monosaccharide is :

• cellulose

• starch

• fructose

• sucrose

Which one of the following is an ester ?

• Coconout oil

• Kerosene oil

• Soap

• Glycerine

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

A catalyst :

• lowers the activation energy

• change the rate constant

• change the product

• itself destroys in the reaction

Glucose is a/an:

• polyhydroxy ketone

• alcohol

• hydrate of carbon

• pentahydroxy aldehyde

Ribose is an example of:

• ketohexose

• disaccharide

• pentose

• polysaccharide