51.

Grignard reagent adds to

• >C = O

• -C ≡ N

• >C = S

• All of these

Which of the following biomolecules contain non-transition metal ion ?

• Vitamin B₁₂

• Chlorophyll

• Haemoglobin

• Insulin

Three dimensional molecules with cross links are formed in the case of a

• thermoplastic

• thermosetting plastic

• Both (a) and (b)

• None of the above

Sucrose molecule is made up of

• a gluco pyranose and a fructo pyranose

• a gluco pyranose and a fructo furanose

• a gluco furanose and a fructo pyranose

• a gluco furanose and a fructo furanose

Water insoluble component of starch is

• amylopectin

• amylose

• cellulose

• None of the above

An example for a saturated fatty acid, present in nature is

• oleic acid

• linoleic acid

• linolenic acid

• palmitic acid

A nanopeptide contains ....... peptide linkages

• 10

• 8

• 9

• 18

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

Antiseptic chloroxylenol is

• 4-chloro-3, 5-dimethyl phenol

• 3-chloro-4, 5-dimethyl phenol

• 4-chloro-2, 5-dimethyl phenol

• 5-chloro-3,4-dimethyl phenol