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NEET UG Biomolecules — practice questions — page 4

Explore 116 free Biomolecules questions in NEET UG Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Biomolecules questions and exercises with answers

Showing questions 91–116 of 116.

Which scientist proposed the lock and key model in 1894?Read the answer and worked solution →What effect does low temperature have on an enzyme?Read the answer and worked solution →Why does reaction velocity level off at Vmax as substrate rises?Read the answer and worked solution →What is an inhibitor that closely resembles the substrate in structure called?Read the answer and worked solution →Malonate is a classic competitive inhibitor of which enzyme?Read the answer and worked solution →Which type of inhibition can be overcome by raising substrate concentration?Read the answer and worked solution →How does a non-competitive inhibitor change enzyme kinetics?Read the answer and worked solution →Which inhibitor binds only to the enzyme-substrate complex?Read the answer and worked solution →Aspirin and penicillin inhibit their target enzymes in what way?Read the answer and worked solution →Cyanide blocks cellular respiration by inhibiting which enzyme?Read the answer and worked solution →Which enzyme is the target of the drug methotrexate?Read the answer and worked solution →An end product slowing the first enzyme of its own pathway is an example of what?Read the answer and worked solution →Dehydrogenases belong to which class of enzymes?Read the answer and worked solution →Which enzyme class breaks ester, peptide and glycosidic bonds by adding water?Read the answer and worked solution →Which enzymes remove groups by means other than hydrolysis, leaving double bonds?Read the answer and worked solution →Which enzyme class joins two compounds by forming C-O, C-S or C-N bonds?Read the answer and worked solution →What is the protein part of an enzyme that needs a cofactor called?Read the answer and worked solution →What is an enzyme together with its required cofactor called?Read the answer and worked solution →How do prosthetic groups differ from other cofactors?Read the answer and worked solution →Coenzymes NAD and NADP contain which vitamin?Read the answer and worked solution →Which metal ion is a cofactor of carboxypeptidase?Read the answer and worked solution →What name did Eduard Buchner give the enzyme fermenting sucrose in yeast extract?Read the answer and worked solution →What does the Michaelis constant Km represent?Read the answer and worked solution →What does the turnover number kcat measure?Read the answer and worked solution →Which enzyme is used in meat tenderizers?Read the answer and worked solution →What effect do enzymes have on a reaction's equilibrium position?Read the answer and worked solution →

Worked practice questions

Which scientist proposed the lock and key model in 1894?

  1. Eduard Buchner
  2. Emil Fischer
  3. James Sumner
  4. Anselme Payen
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Correct answer: B. Emil Fischer

Emil Fischer argued that enzyme and substrate have complementary shapes that fit exactly into each other.

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What effect does low temperature have on an enzyme?

  1. It destroys it permanently
  2. It doubles its activity
  3. It keeps it temporarily inactive
  4. It removes its cofactors
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Correct answer: C. It keeps it temporarily inactive

Cold preserves an enzyme in a temporarily inactive state, whereas heat denatures it.

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Why does reaction velocity level off at Vmax as substrate rises?

  1. The substrate gets denatured
  2. The products stop forming
  3. The pH falls below optimum
  4. All enzyme molecules are saturated
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Correct answer: D. All enzyme molecules are saturated

Enzyme molecules are fewer than substrate molecules, so once all are bound no free enzyme is left for extra substrate.

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