Phenylketonuria is a disorder characterized by abnormal levels of phenylalanine in the body. It is caused by mutation in DNA that leads to the deficiency of an enzyme known as phenylalanine hydroxylase, which converts phenylalanine to tyrosine, a fundamental substance for dopamine production - related to working memory.

Some of the symptoms of this disorder is intellectual disability, which is caused mainly by demyelination or defective myelin biosynthesis, leading to the inhibition of myelin, a fatty insulating sheath that protects nerves.

Therefore, the cause of the intellectual disability in the individual is the inhibition of normal myelin development in the individual's brain.

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3 years ago

Roger Sherman helped construct the ???

kompoz [17]

As a member of the Committee of Five (the committee that drafted the Declaration of Independence which was comprised by Benjamin Franklin, John Adams, Robert Livingston, and Thomas Jefferson) , he helped draft the Declaration of Independence of the United States of America.

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3 years ago

Four languages spoken in spain ? what are they?

professor190 [17]

Answer: Castilian, Catalan, Galician, Basque

Explanation:

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3 years ago

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