Answer:
C. A mutation in the operator sequence
Explanation:
The operator sequence of the lac operon serves as the site for the binding of repressor protein. When repressor protein is bound to the operator sequence, the enzyme RNA polymerase is inhibited to carry out the process of transcription of the structural genes of the operon. Binding of allolactose to repressor does not allow it to bind to the operator sequence. This allows the expression of the lac operon in the presence of lactose sugar.
Any mutation in the operator region that disturbs the binding of the repressor to it would allow the expression of lac operon even in the absence of lactose allowing it to be expressed in a constitutive manner.
Newborns receive a single injection of vitamin K at birth due to the fact that the newborns don't have enough bacteria to make vitamin K.
Vitamin K at birth helps the blood to clot and prevents serious bleeding. In newborns, vitamin K injections can prevent a now rare, but potentially fatal, bleeding disorder called 'vitamin K deficiency bleeding' also known as 'hemorrhagic disease of the newborn'.
They both stand for something your allergic too
Answer:
Protects from radiation, flying particles, debris, sparks, intense light, irritation and chemical burns