An example ofa sulphur contaming amino acid is

• lysine

• serine

• cysteine

• tyrosine

Which of the following is not present in a nucleotide?

• Cytosine

• Guanine

• Adenine

• Tyrosine

The amino acid which is not optically active is

• lactic acid

• serine

• alanine

• glycine

Glucose contains in addition to aldehyde group:

• one secondary OH and four primary OH groups

• one primary OH and four secondary OH groups

• two primary OH and three secondary OH groups

• three primary OH and two secondary OH groups

A distinctive and characteristic functional group of fats is

• a peptide group

• an ester group

• an alcoholic group

• a ketonic group

156.

At pH = 4, glycine exists as

• ${\mathrm{H}}_3\stackrel{+}{\mathrm{N}}-{\mathrm{CH}}_2- {\mathrm{COO}}^{-}$

• ${\mathrm{H}}_3\stackrel{+}{\mathrm{N}}-{\mathrm{CH}}_2- \mathrm{COOH}$

• ${\mathrm{H}}_2\mathrm{N}-{\mathrm{CH}}_2- {\mathrm{COO}}^{-}$

• ${\mathrm{H}}_2\mathrm{N}-{\mathrm{CH}}_2- \mathrm{COOH}$

Insulin regulates the metabolism of

• minerals

• amino acids

• glucose

• vitamins

Acrolein test is positive for:

• polysaccharides 

• proteins

• oils and fats

• reducing sugars

The number of disulphide linkages present in insulin are

• 1

• 2

• 3

• 4

A metal present in vitamin B₁₂ is

• aluminium

• zinc

• iron 

• cobalt