Free Enzymes as Biocatalysts MCQs with Answers
41 Enzymes as Biocatalysts MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Enzymes are protein or RNA biocatalysts that lower activation energy without being consumed, and their active sites bind specific substrates. The topic covers the lock and key and induced fit models, effects of temperature, pH and substrate concentration, cofactors, enzyme specificity, and competitive versus non-competitive inhibition.
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- A. Homogeneous catalysis
- B. Heterogeneous catalysis
- C. Catalysis
- D. Ea
Explanation: When the catalyst and reactants are present in different physical phases, the process is heterogeneous catalysis.
Correct answer: Heterogeneous catalysis- A. Isomerases
- B. Lyases
- C. Transferases
- D. Ligases
Explanation: Isomerases catalyse intramolecular rearrangements, transferring a group from one position to another within the same molecule.
Correct answer: Isomerases- A. Lactic dehydrogenase
- B. Alkaline phosphatase
- C. L-asparaginase
- D. Cellulase
Explanation: L-asparaginase is useful in treating some leukemias because it hydrolyses circulating asparagine, depriving certain cancer cells of an…
Correct answer: L-asparaginase- A. Oxidoreductases
- B. Hydrolases
- C. Isoenzymes
- D. Isomerases
Explanation: Isoenzymes are different molecular forms of an enzyme found in the same organism that catalyse the same reaction but differ in physical…
Correct answer: Isoenzymes- A. Lyases
- B. Ligases
- C. Lipases
- D. Hydrolases
Explanation: Lipases are enzymes that hydrolyse triglycerides into glycerol and fatty acids.
Correct answer: Lipases- A. Carbohydrates
- B. Proteins
- C. Lipids
- D. Fats
Explanation: Proteins are large, complex molecules composed of amino acids. They play a crucial role in almost all biological processes, serving as…
Correct answer: Proteins- A. Mn2+
- B. Mg2+
- C. Zn2+
- D. None of these options are correct
Explanation: OPTION A: The activator of the phosphatase enzyme is not Mn2+ because it is not the right type of ion to activate the enzyme.OPTION B: The…
Correct answer: Mg2+- A. Mn2+
- B. Mg2+
- C. Zn2+
- D. None of these
Explanation: Zn2+ is the activator of carbonic anhydrase.
Correct answer: Zn2+- A. Oxidoreductase
- B. Hydrolases
- C. Ligases
- D. Transferases
Explanation: Option A is correct as dehydrogenase removes hydrogens thus oxidises the substrate, therefore it is under "oxidoreductase".
Correct answer: Oxidoreductase- A. Lyases
- B. Hydrolases
- C. Ligases
- D. Transferases
Explanation: Option A is correct since lyases are enzymes that catalyze the breakdown of specific covalent bonds and the removal of groups without…
Correct answer: Lyases- A. LDH-1.
- B. Protease.
- C. Alkaline Phosphate.
- D. None of these options is correct.
Explanation: Alkaline phosphatase is used for the diagnosis of jaundice. It is the condition in which the skin, white of the eyes, and mucous membrane…
Correct answer: Alkaline Phosphate.- A. Thrombin
- B. L-asparaginase
- C. Both
- D. None iof these
Explanation: There are several types of enzymes that are currently being studied for the treatment of cancer in children.
Correct answer: L-asparaginase- A. Vitamins
- B. DNA
- C. Coenzyme
- D. None
Explanation: Option C is correct.Enzymes are proteins which help to catalyze the biochemical reaction.
Correct answer: Coenzyme- A. Coenzyme
- B. Cofactor
- C. Apoenzyme
- D. Prosthetic group
Explanation: Apoenzyme is a protein part that binds to a non-protein cofactor to form an active conjugated enzyme known as the holoenzyme.
Correct answer: Apoenzyme- A. Thousands
- B. Millions
- C. Hundreds
- D. Billions
Explanation: Enzymes can be denatured and precipitated with salts, solvents, and other reagents.
Correct answer: Millions- A. Vitamins
- B. DNA
- C. Coenzyme
- D. None of these options are correct
Explanation: The non-protein partco-factor includes organic and metallic organic molecules and sometimes Vitamins.
Correct answer: Vitamins- A. Coenzymes
- B. Holoenzymes
- C. None of these
- D. Both of these
Explanation: A coenzyme is defined as an organic molecule that binds to the active sites of certain enzymes to assist in the catalysis of a reaction.
Correct answer: Coenzymes- A. Hydrolases
- B. Lyases
- C. Transferases
- D. Ligases
Explanation: Ligases are enzymes capable of catalyzing the reaction of joining two large molecules by establishing a new chemical bond.Carboxylase is…
Correct answer: Ligases- A. Hexokinase
- B. Glucokinase
- C. Fructokinase
- D. Malonic acid
Explanation: Hexokinase is an enzyme that is used in a glycolysis process. It catalyzes the reaction by phosphorylating glucose into…
Correct answer: Hexokinase- A. Zymase
- B. Invertase
- C. Cellulose
- D. Urease
Explanation: Explanation:Concentrated sugar solution undergoes hydrolysis into glucose and fructose by enzyme called Invertase.
Correct answer: Invertase