Factors Affecting Enzyme Activity MCQs

Factors Affecting Enzyme Activity MCQs

Factors Affecting Enzyme Activity – Definition


Enzymes are biological catalysts that can accelerate a specific chemical reaction by lowering the activation energy but remain un-altered in the process. Factors affecting enzyme activity can alter the three-dimensional shape of an enzyme. Two factors affect enzyme activity, these includes; temperature and pH.

Table of Content:
  • Introduction To Factors Affecting Enzyme Activity
  • Temperature Affecting Enzyme Activity
  • pH Value Effect on Enzyme Activity

All of these MCQs on “Factors Affecting Enzyme Activity” in Zoology MCQs are preferably for test / interview preparation for BSc, MSc, BS (Hons), NTS, FPSC, PPSC, PTS, CSS, MDCAT, ECAT, MCAT and all other competitive examination for foreign study including overseas students.

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Factors Affecting Enzyme Activity MCQs (Questions and Answers)


Introduction To Factors Affecting Enzyme Activity:

Q1. How factors affecting the enzyme activity?

  1. Alter the three-dimensional shape of an enzyme
  2. Speed up the chemical reactions
  3. Lower the activation energy
  4. All of the above

Answer: a

Q2. How many factors affect the enzyme activity?

  1. 1
  2. 2
  3. 3
  4. 4

Answer: b

Q3. Name the factors which affect the enzyme activity.

  1. Temperature
  2. pH value
  3. Atmospheric Pressure
  4. Both a and b

Answer: d

Temperature Affecting Enzyme Activity:

Q4. The shape of a protein or nucleic acid is determined by its _____________.

  1. Chemical bonds
  2. hydrogen bonds
  3. covalent bonds
  4. none

Answer: b

Q5. Which factors disrupt hydrogen bonds?

  1. pH value
  2. Atmospheric pressure
  3. Temperature
  4. Activation energy

Answer: c

Q6. The enzyme of most of birds and mammals have function in a narrow range of ______________.

  1. Temperature
  2. pH value
  3. Atmospheric pressure
  4. Activation energy

Answer: a

Q7. Which is necessary for substrate to fit into a reactive site?

  1. three dimensional globular protein molecules
  2. change of shape
  3. low temperature
  4. none

Answer: b

Q8. At which temperature the bonds of protein of enzymes are not flexible?

  1. 30° C
  2. 40° C
  3. 35° C
  4. 45° C

Answer: c

Q9. Which factor does not permit the change in shape of the reactive site?

  1. Low temperature
  2. High temperature
  3. Moderate temperature
  4. None

Answer: a


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Q10. When the bonds are too weak to hold the protein in proper position above 40° C, then enzyme:

  1. maintain its shape
  2. cannot maintain its shape
  3. none

Answer: b

Q11. Enzyme destroyed when proper shape is lost. This is called _________.

  1. destruction
  2. reformation
  3. denaturation
  4. none

Answer: c

pH Value Effect on Enzyme Activity:

Q12.  Optimum pH of most enzymes is between:

  1. 4 and 6
  2. 6 and 8
  3. 8 and 10
  4. neutral

Answer: b

Q13. On which pH, the H+ ions combine with the R groups of the enzyme’s amino acids. So it reduces their ability to bind with substrates?

  1. Too high pH
  2. Moderate pH
  3. Too low pH
  4. None

Answer: c


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Q14. Which environment can also denature enzymes?

  1. Acidic
  2. Basic
  3. Neutral
  4. None

Answer: a

Q15. Attachment of which to an enzyme changes the shape of the protein and allows it to combine with its substrate?

  1. Coenzymes
  2. Cofactors
  3. Substrates
  4. None

Answer: b

Q16. Which enzymes function at a low pH of 2?

  1. Pepsin
  2. Trypsin
  3. Both a and b
  4. None

Answer: a

Q17. Pepsin has an amino acid sequence.              True/False

Answer: True

Q18. The amino acid sequence of trypsin maintains its ionic and hydrogen bonds. So it can function at such low pH

Answer: False (pepsin)

Q19. Which enzyme active in the more basic medium of pH 9?

  1. Pepsin
  2. Trypsin
  3. Both a and b
  4. None

Answer: b

Q20. The optimum pH of an enzyme shows the pH of the body fluid. Enzymes are found in this fluid.

Answer: True

Q21. The more basic medium  pH 9, is found in the small intestine of ______________.

  1. birds
  2. reptiles
  3. mammals
  4. amphibians

Answer: c

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