Free download Biology Paper Chapter 3

Schedule test                     FSc. 1st Year                     Time Allowed: 20 min

BIOLOGY (objective)        Chapter (3)                    Total Marks: 17 

                                                                               

Note: Attempt all questions.

Q .No.1: Four possible answers are given. Encircle the best option. (17)

1.            An activated enzyme consisting of polypeptide chain and a cofactor is called:

              a) Apoenzyme   b) Holoenzyme    c) Alloenzyme   d) None of these

    2.     The reactant called---------is attached to the active site of enzyme:

            a) Co-enzyme   b) Cofactor   c) Substrate    d) Prosthetic group

    3.     For enzymes of human body, the optimum temperature is:

            a) 37˚C    b) 98.6˚C    c) a & b    d) None of these

   4.      Lock and key model of enzymes was proposed by:

            a) Koshland    b) Emil Fisher    c) L. Pauling   d) Altman

   5.      ----------- acts as inhibitor of succinate dehydrogenase:

            a) Malonic acid    b) Fumeric acid     c) Succinic acid  d) Fumerate

   6.      An enzyme and its substrate react with each other through definite

             charge bearing site called ………. Site.

            a) Catalytic    b) Passive   c) Binding    d) Active

  7.       An enzyme is a three dimensional:

            a) Fibrous protein    b) Straight protein   c) Branched protein

            d) Globular protein

  8.       The optimum pH of Arginase is:

            a) 7.70     b) 9.70    c) 5.60      d) 4.25

  9.       The activation energy of reaction is lowered by:

            a) Coenzyme    b) Substrate     c) enzyme     d) Product

  10.     Some metal ions are used by enzymes as:

            a) Prosthetic group   b) Cofactor   c) a & b    d) None of these

  11.     Reversible inhibitors form weak linkage with the:

            a) Enzyme     b) Reactant    c) Product     d) Substrate

  12.     The detachable cofactor is known as an activator if it is:

             a) Organic ion       b) Non-ionic    c) Inorganic ion   d) None of these

  13.     Chemical reaction can be accelerated by an enzyme even in:

             a) Small amount   b) Moderate amount   c) Large amount  

            d) All of these

  14.     Enzyme without cofactor is called:

            a) Passive enzyme   b) Allosteric enzyme     c) Holoenzyme

             d) Apoenzyme

  15.      If non-protein portion is loosely attached to protein part it is called:

              a) Co-protein      b) Coenzyme    c) Co-molecule     d) None of these

  16.       Induce Fit Model was put forward by:

              a) Robert Koch     b) Louis Pasteur    c) Emil Fischer   d) Koshland

17.         Reversible inhibitor forms:

             a) Weak linkage with enzyme          b) Strong linkage with enzyme

             c) Either “a” or “b”              d) none of these