A constitutive mutation in the lac operon may be of several types. Name two types of constitutive mutations and explain why they are constitutive
What will be an ideal response?
lacI? is a lac operon constitutive mutation because it is unable to bind to the operator DNA. If it can't bind, then the operon will not be inhibited. Similarly, the lacOc mutation causes a constitutive expression of the lac operon genes. This is because the lacOc mutation removes the operator and without an operator the operon cannot be turned off.
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A. true B. false
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Radially symmetrical animals have a nerve
__________. Fill in the blank(s) with the appropriate word(s).