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BIOLOGY 1st YEAR Latest Pattern 2020

Hooker test seriese
BIOLOGY     1st YEAR        Time Allowed = 1:15 Minutes                      MAX. MARKS=30
CHAPTER # 03 ENZYMES                                                                       PASS MARKS=20
Name_____________________        PART I          (OBJECTIVE)         

NOTE: Draw neat and labeled diagrams or fig. where necessary.
Q # 1 Direction: Encircle the correct options (10).
1.  The active site of enzyme is made up of:
a) Binding site b) Catalytic site c) Reactive site                     d) Both a & b
2. If the non-protein part is covalently bonded then it is known as:
a) Activator     b) Coenzyme   c) Prosthetic group      d) All
3. Which one is used again and again?
a) Enzymes      b) Vitamins     c) Holoenzyme            d) All of the above
4. Which reaction is the cause of activation of catalytic site?
a) Substrate formation            b) Substrate recognition          c) Enzyme substrate complex d) Product formation
5. The specificity of enzyme is due its:
a) Chemistry    b) Configuration c) Both a & b   ) Non of the above
6. When will the enzyme is said to be the denatured?
a) At high temperature   b) Vibration of molecules is high     c) Globular structure deformation  d) All
7. The optimum pH of catalase is:
a) 7.00-8.00                 b) 5.50             c) 7.60             d) 6.80
8. Change in specific pH of an enzyme causes ionization of_____ that leads to retardation in enzyme action:
a) Substrate     b) Enzyme       c) Both a & b  d) None of the above
9. Succinic acid is catalyzed into the fumaric acid by the enzyme that is
a) Succinate     b) Succinic acid fumarase       c) Succinic dehydrogenase     d) Succinic hydrogenase
10. Poisons like cyanide, antibodies are the examples of
a) Enzymes      b) Coenzymes c) Inhibitors     d) Holoenzymes

Q # 2 Write down the answers of the following questions.            2x10=20
  1. Is it correct that most of the enzymes are found in the membrane systems of the cell?
  2. Define activation energy.
  3. Define holoenzyme and apoenzyme.
  4. Define the Competitive inhibitors.
  5. What is the feed back mechanism? What is its importance?
  6. Differentiate between lock and key model and induced fit model.
  7. How the effect of reversible inhibitors can be neutralized?
  8. Differentiate between prosthetic group and coenzyme.
  9. Why some enzymes can be harmful if they are secreted in their active form? Give example.
  10. Can life possible with out enzymes?
By M Rashid ul Hassan Saeedi

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