Biomolecules

Which one of the following statements is wrong?

• cellulose is a polysaccharide

• Uracil is a pyrimidine

• Glycine is a sulphur containing amino acid

• Glycine is a sulphur containing amino acid

The amino acid, trytophan is the precussor for the synthesis of

• thyroxine and tri-iodothryonine

• estrogen and progesterone

• cortisol and cortisone

• cortisol and cortisone

A typical fat molecule is made up of

• One glycerol and three fatty acid molecules

• One glycerol and one fatty acid moleule

• Thre glycerol and three fatty acid molecules

• Thre glycerol and three fatty acid molecules

Transition state structure of the substrate formed during an enzymatic reaction is

• transient but stable

• permanent but unstable

• transient and unstable

• transient and unstable

Which of the metabolites is common to respiration mediated breakdown of fats, carbohydrates and proteins?

• Glucose-6-phosphate

• Fructose 1, 6-biphosphate

• Pyruvic acid

• Pyruvic acid

Macromolecule chitin is

• Nitrogen containing polysaccharide

• phosphorus-containing polysaccharide

• sulphur containing polysaccharide

• sulphur containing polysaccharide

The essential chemical components of many coenzymes are

• proteins 

• nuclei acids

• carbohydrates

• carbohydrates

Which of the following biomolecules does have a phosphodiester bond?

• Fatty acids in a diglyceride

• Monosaccharides in a polysaccharide

• Amino acids in a polypeptide

• Amino acids in a polypeptide

Select the option which is not correct with respect to enzyme action.

• Substrate binds with enzyme as its active site

• Addition of lot of succinate does not reverse the inhibition of succinic dehydrogenase by malonate

• A non- competitive inhibitor binds the enzyme at asite distinct from that which binds as the substrate

• A non- competitive inhibitor binds the enzyme at asite distinct from that which binds as the substrate

Which one of the following is a non-reducing carbohydrate?

• Maltose

• Sucrose

• Lactose

• Lactose