Answer:
b. newborn screening (either assaying for the GALT enzyme or measuring excess galactose in the newborn’s blood).
Explanation:
Neonatal screening is a preventive action that allows the diagnosis of various asymptomatic congenital or infectious diseases in the neonatal period in time to interfere with the course of the disease, thus allowing the institution of specific early treatment and the reduction or elimination of the disease. sequelae associated with each disease.
In the case of Jane and John's neonatal screening, the objective is to verify whether the child inherited (or would inherit) the galactose allele. This would be done by testing the enzyme GALT or by measuring excess galactose in the newborn's blood.
Internal means its on the inside
external means its on the outside
so an internal regulator is when the proteins respond to events on the inside of a cell
and an external regulator is when the proteins respond to events outside the cell
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