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Q.1. Feedback inhibition of enzymes is affected by which of the following

  1. enzyme
  2. substrate
  3. end products
  4. intermediate end products
Answer: (c) end products
Explanation: end products

Biomolecules Class 11 Biology Test | MCQs For NEET

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This practice test includes 25 important multiple-choice objective questions from the chapter Biomolecules Class 11th. Start Test without Login in
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Q.1. Feedback inhibition of enzymes is affected by which of the following

  1. enzyme
  2. substrate
  3. end products
  4. intermediate end products

Q.2. An example of competitive inhibition of an enzyme is the inhibition of

  1. succinic dehydrogenase by malonic acid
  2. cytochrome oxidase by cyanide
  3. hexokinase by glucose-6-phosphate
  4. carbonic anhydrase by carbon dioxide

Q.3. Insulin is made up of _______ and _______.

  1. glucose and fructose
  2. glucose and fructose
  3. fructose and mannose
  4. mannose and glucose

Q.4. Enzymes increase the rate of reaction by

  1. lowering activation energy
  2. increasing activation energy
  3. increasing temperature and pH
  4. decreasing temperature and pH

Q.5. Which of the following statements regarding enzyme inhibition is correct?

  1. Competitive inhibition is seen when a substrate competes with an enzyme for binding to an inhibitor protein
  2. Non-competitive inhibitors often bind to the enzyme irreversibly
  3. Competitive inhibition is seen when the substrate and the inhibitor compete for the active site on the enzyme
  4. Non-competitive inhibition of an enzyme can be overcome by adding large amount of substrate

Q.6. Which of the following is not a pyrimidine?

  1. Uracil
  2. Cytosine
  3. Guanine
  4. Thymine

Q.7. Hydrolysis of starch occurs with the help of

  1. Peptidase
  2. Amylase
  3. Sucrose
  4. Lipase

Q.8. Assertion: Arachidic acid is an unsaturated fatty acid Reason: There are one or more double bonds between carbon atoms in unsaturated fatty acids

  1. Both Assertion and Reason are true and Reason is the correct explanation of the Assertion
  2. Both Assertion and Reason are true but the Reason is not the correct explanations of Assertion
  3. Assertion is true, but Reason is false.
  4. Both Assertion and Reason are false

Q.9. Which of the following influence feedback inhibition of enzyme?

  1. End product
  2. External factors
  3. Enzyme
  4. Substrate

Q.10. Which of the following is not a polysaccharide?

  1. Lactose
  2. Starch
  3. Glycogen
  4. Dextrin

Q.11. Inulin is made up of _______ and _______

  1. glucose and fructose
  2. glucose and fructose
  3. fructose and mannose
  4. mannose and glucose

Q.12. A protein having both structural and enzymatic traits is

  1. Collagen
  2. Trypsin
  3. Myosin
  4. Actin

Q.13. NADP contains vitamin ______

  1. B1
  2. B2
  3. B3
  4. B12

Q.14. With reference to enzymes, which one of the following statements is true?

  1. Apoenzyme = Holoenzyme + Coenzyme
  2. Coenzyme = Apoenzyme + Holoenzyme
  3. Holoenzyme = Apoenzyme + Coenzyme
  4. Holoenzyme = Coenzyme ? Apoenzyme

Q.15. Inhibitor binds to the active site of the enzyme. Hence blocking the reaction. This is an example of

  1. allosteric inhibition
  2. feedback inhibition
  3. uncompetitive inhibition
  4. competitive inhibition

Q.16. The fastest enzyme known is

  1. DNA polymerase
  2. carbonic anhydrase
  3. carbonic dehydrogenase
  4. DNA ligase

Q.17. Lecithin is a

  1. polysaccharide
  2. protein
  3. nucleic acid
  4. lipid

Q.18. The minimum amount of energy required to initiate a chemical reaction is called

  1. enzymatic energy
  2. activation energy
  3. substrate energy
  4. initiation energy

Q.19. Enzymes, vitamins and hormones are common in

  1. Enhancing oxidative metabolism
  2. Being synthesised in the body of organisms
  3. Being proteinaceous
  4. Regulating metabolism

Q.20. Nitrogenous bases present in DNA

  1. Adenine, guanine, cytosine, uracil
  2. Adenine, guanine, cytosine, thymine
  3. Adenine, thymine, uracil
  4. Guanine, uracil

Q.21. Metabolic intermediates found in living system which are essential for growth and life is called___________

  1. Saponins
  2. Tannins
  3. Secondary metabolite
  4. Primary metabolites

Q.22. Enormous diversity of protein molecules is due to

  1. R groups of amino acids
  2. Sequence of amino acids
  3. Peptide bonds
  4. Amino groups of amino acids

Q.23. Anti-parallel strands of a DNA molecule mean that

  1. One strand turns anticlockwise
  2. Phosphate groups at the start of two DNA strands (poles) are in opposite position
  3. Phosphate groups of two DNA strands at their ends share the same position
  4. One strand turns clockwise

Q.24. The introduction of t-DNA into plants involves

  1. Altering the pH of the soil, then heat shocking the plants
  2. Exposing the plants to cold for a brief period
  3. Allowing the plant roots to stand in water
  4. Infection of the plant by Agrobacterium tumefaciens

Q.25. The most common monomer of carbohydrates is

  1. Sucrose
  2. Fructose
  3. Maltose
  4. Glucose
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