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Question
For the following genotypes of E. coli strains, state whether
enzyme activity is inducible (I), constitutive (C), or uninducible (U).
Key to symbols in table:
z = structural gene for -galactosidase
y = structural gene for permease
a = structural gene for transacetylase
p = promoter (for lac operon)
i = structural gene for the lac repressor (regulator gene)
o = operator (binding site for repressor)
Genotype -gal (z) Permease (y) Transacetylase (a)
i+ p+ oC z- y- a+
i- p+ o+ z+ y- a- /
i+ p- oc z- y+ a-
i- p+ o+ z+ y- a+ /
i+ p+ oc z- y+ a-
i+ p+ o+ z- y- a+
i- p- o+ z+ y- a+ /
i- p+ o+ z- y+ a-
iS p+ o+ z- y- a+
i- p+ o+ z+ y- a+ /
i+ p- oc z- y+ a-
is p+ o+ z- y+ a+ /
i+ p+ oc z+ y- a-
i- p- o+ z+ y- a+ /
i- p+ o+ z- y- a-
is p+ oc z+ y- a+
i+ p+ oc z+ y- a+
enzyme activity is inducible (I), constitutive (C), or uninducible (U).
Key to symbols in table:
z = structural gene for -galactosidase
y = structural gene for permease
a = structural gene for transacetylase
p = promoter (for lac operon)
i = structural gene for the lac repressor (regulator gene)
o = operator (binding site for repressor)
Genotype -gal (z) Permease (y) Transacetylase (a)
i+ p+ oC z- y- a+
i- p+ o+ z+ y- a- /
i+ p- oc z- y+ a-
i- p+ o+ z+ y- a+ /
i+ p+ oc z- y+ a-
i+ p+ o+ z- y- a+
i- p- o+ z+ y- a+ /
i- p+ o+ z- y+ a-
iS p+ o+ z- y- a+
i- p+ o+ z+ y- a+ /
i+ p- oc z- y+ a-
is p+ o+ z- y+ a+ /
i+ p+ oc z+ y- a-
i- p- o+ z+ y- a+ /
i- p+ o+ z- y- a-
is p+ oc z+ y- a+
i+ p+ oc z+ y- a+
Transcribed Image Text:Key to symbols in table:
z = structural gene for ß-galactosidase
y = structural gene for permease
a = structural gene for transacetylase
p = promoter (for lac operon)
i = structural gene for the lac repressor (regulator gene)
o = operator (binding site for repressor)
ß-gal (z)
Genotype
i+ p+ oc z-y-a+
i- pt o+ z+ y- a- /
i+ p- oc z- y+ a-
i- p¹ ot z+ y¯ a+ /
i+ p¹ oc z- y+ a-
i+p+ o+ z-y-a+
i- p- ot z+ y a+ /
i-p+ o+ z- y+ a-
is poz yat
i¯ p* o* z+ y− a+ /
i+ p- oc z-y+ a-
is p+ ot z¯ y+ a¹ /
i+p+ oc z+ y-a-
i- p- o+z+ya+/
i-p+o+ z-ya-
is p+ oc z+ y a+
it p* oº z yat
Permease (y)
Transacetylase (a)
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