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

  • thyroxine and tri-iodothryonine

  • estrogen and progesterone

  • cortisol and cortisone

  • melatonin and serotonin

Which of the following biomolecules does have a phosphodiester bond?

  • Fatty acids in a diglyceride

  • Monosaccharides in a polysaccharide

  • Amino acids in a polypeptide

  • Nucleic acids in a nucleotide

All enzymes of TCA cycle are located in the mitochondrial matrix except one which is located in inner mitochondrial membranes in eukaryotes and in cytosol in prokaryotes. This enzyme is

  • lactate dehydrogenase

  • isocitrate dehydrogenase

  • malate dehydrogenase

  • succinate dehydrogenase

Which one is the most abundant protein in the animal world?

  • Trypsin

  • Haemoglobin

  • Collagen

  • Insulin

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

  • Malonate is a competitive inhibitor of succinic dehydrogenase

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