Enzyme: MCQs Quiz – 1 24

24 thoughts on “Enzyme: MCQs Quiz – 1”

• Reply ↓

  puneet at

  hi everyone
  for Q.12 i think option 1 is not valid for all enzymes as we know all enzymes are not proteins and some thermophilic organisms have enzymes which are stable even at 80-90C i.e. a high temperature so best choice will b 2nd as it is always applicable while proteinaceous enzymes have tertiary structure of proteins which always get denatured at high temp(except thermophilic enzymes)

  while the primary structure of proteins is never denatured at high temp/pressure
  which may be the case of dietary proteins

• Reply ↓

  annie at

  nice set of questions…

• Reply ↓

  Mansimran at

  Hiii..
  I feel the answer to question no.12 should be ‘A’ as enzymes becomes get denatured at high temp. whereas catalysts do not.AM I right!

  • Reply ↓

    Muhammed ilyas khan at

    At high temprature the enzymes denatures because enzymes are made of globular proteins .and proteins are made from combination of many amino acids so amoung linkage of this amino acids there is bond called peptide bond so at high temprature the peptide breaks down and the whole polypeptide chain breaks into simple once to amino acid so thus enzyme becomes denature.as we can say that at high temprature the peptide bonds amoung amino acid of enzymes breaks and enzyme becomes denature(functionless)

    • Reply ↓

      Ramesh at

      No sir, peptide bonds are not broken on heating. If that was the case, all dietary proteins would be converted into amino acids on cooking. On heating, hydrogen bonds are broken resulting into unfolding and uncoiling of proteins. This is known as denaturation.

• Reply ↓

  guleqazi at

  nice questions i like that web site very mucd good work guys 😀

• Reply ↓

  JAGDESH KUMAR at

  cnfuse abut questn 5 n wat the ki stand fr