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					Enzymes

- exercise -
Each question of the test contains 4 statements (a, b, c, d). You can obtain
 1 point (correct answer), –1 point (incorrect answer) or 0 point (if ? is
 marked). All four statements can be either correct or incorrect or some of
   the statements can be correct and some incorrect. Use the following
                   schema to complete the answer table:
Y = I agree with the statement            N = I disagree with the statement
                             ? = I don't know

           No       a            b            c            d
           1    Y N ? Y N ? Y N ? Y N ?

           2    Y N ? Y N ? Y N ? Y N ?

           3    Y N ? Y N ? Y N ? Y N ?

           4    Y N ? Y N ? Y N ? Y N ?

           5    Y N ? Y N ? Y N ? Y N ?
Each question of the test contains 4 statements (a, b, c, d). You can obtain
 1 point (correct answer), –1 point (incorrect answer) or 0 point (if ? is
 marked). All four statements can be either correct or incorrect or some of
   the statements can be correct and some incorrect. Use the following
                   schema to complete the answer table:
Y = I agree with the statement            N = I disagree with the statement
                             ? = I don't know

           No       a            b            c            d
           1    Y N ? Y N ? Y N ? Y N ?

           2    Y N ? Y N ? Y N ? Y N ?

           3    Y N ? Y N ? Y N ? Y N ?

           4    Y N ? Y N ? Y N ? Y N ?

           5    Y N ? Y N ? Y N ? Y N ?
Phosphatase catalyzes

a) insertion of Pi into a substrate

b) removing of Pi from a substrate

c) hydrolysis of an ester bond

d) reaction producing ATP
Phosphatase catalyzes

a) insertion of Pi into a substrate

b) removing of Pi from a substrate

c) hydrolysis of an ester bond

d) reaction producing ATP

    No     a     b       c       d
     1   Y N ? Y N ? Y N ? Y N ?
Choose correct statements:

a) dehydrogenases catalyze oxidative-
   reducing reactions

b) carboxylases need ATP for their
   function

c) kinases transfer a phosphate from an
   energy rich compound to a substrate

d) hydroxylases catalyze oxidation of a
   substrate
Choose correct statements:

a) dehydrogenases catalyze oxidative-
   reducing reactions

b) carboxylases need ATP for their
   function

c) kinases transfer a phosphate from an
   energy rich compound to a substrate

d) hydroxylases catalyze oxidation of a
   substrate
Alanin aminotransferase (ALT)
catalyzes a reaction of Ala with -
ketoglutarate. The reaction produces

a) oxaloacetate

b) aspartate

c) glutamate

d) pyruvate
Alanin aminotransferase (ALT)
catalyzes a reaction of Ala with -
ketoglutarate. The reaction produces

a) oxaloacetate

b) aspartate

c) glutamate

d) pyruvate
Pepsin belongs among

a) lyases

b) peptidases

c) hydrolases

d) transferases
Pepsin belongs among

a) lyases

b) peptidases

c) hydrolases

d) transferases
 Choose a corret statement(s):
a) maximal velocity Vmax is related to maximal
   number of substrate molecules transformed
   by the enzyme per unit of time

b) KM is expressed in velocity units (mol.s-1)

c) KM = concentration of a substrate needed to
   reach ½ Vmax of the reaction

d) KM = concentration of a substrate needed for
   transformation of ½ enzyme molecules to
   complex enzyme-substrate
 Choose a corret statement(s):
a) maximal velocity Vmax is related to maximal
   number of substrate molecules transformed
   by the enzyme per unit of time

b) KM is expressed in velocity units (mol.s-1)

c) KM = concentration of a substrate needed to
   reach ½ Vmax of the reaction

d) KM = concentration of a substrate needed for
   transformation of ½ enzyme molecules to
   complex enzyme-substrate
 KM of a pair enzyme-substrate

a) is decreased by a competitive inhibitor

b) is equal to the concentration of a substrate
   when an activity of the enzyme is maximal

c) is increased by a noncompetitive inhibitor

d) is directly proportional to an affinity of the
   enzyme to its substrate
 KM of a pair enzyme-substrate

a) is decreased by a competitive inhibitor

b) is equal to the concentration of a substrate
   when an activity of the enzyme is maximal

c) is increased by a noncompetitive inhibitor

d) is directly proportional to an affinity of the
   enzyme to its substrate
Choose a correct statement(s):
a) an inhibition is competitive if an inhibitor
   competes with a substrate to be bound
   into an active site of an enzyme

b) a noncompetitive inhibition can be
   decreased by an increasing of a substrate
   concentration

c) competitive inhibitors have very often a
   similar structure as a substrate

d) noncompetitive inhibitors decrease Vmax
Choose a correct statement(s):
a) an inhibition is competitive if an inhibitor
   competes with a substrate to be bound
   into an active site of an enzyme

b) a noncompetitive inhibition can be
   decreased by an increasing of a substrate
   concentration

c) competitive inhibitors have very often a
   similar structure as a substrate

d) noncompetitive inhibitors decrease Vmax
Choose the proper graph describing

a) competitive
   inhibition

b) noncompetitive
   inhibition

c) inhibition by
   substrate excess
                               1
d) allosteric enzyme
Choose the proper graph describing

a) competitive
   inhibition

b) noncompetitive
   inhibition

c) inhibition by
   substrate excess
                               2
d) allosteric enzyme
Choose the proper graph describing

a) competitive
   inhibition

b) noncompetitive
   inhibition

c) inhibition by
   substrate excess
                               3
d) allosteric enzyme
Choose the proper graph describing

a) competitive
   inhibition

b) noncompetitive
   inhibition

c) inhibition by
   substrate excess

d) allosteric enzyme
                               4
Choose the proper graph describing

a) competitive
   inhibition

b) noncompetitive
   inhibition

c) inhibition by
   substrate excess
                               1
d) allosteric enzyme
Choose the proper graph describing

a) competitive
   inhibition

b) noncompetitive
   inhibition

c) inhibition by
   substrate excess
                               2
d) allosteric enzyme
Choose the proper graph describing

a) competitive
   inhibition

b) noncompetitive
   inhibition

c) inhibition by
   substrate excess
                               3
d) allosteric enzyme
Choose the proper graph describing

a) competitive
   inhibition

b) noncompetitive
   inhibition

c) inhibition by
   substrate excess

d) allosteric enzyme
                               4

				
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posted:3/28/2013
language:Galician
pages:25