Regarding Fragile X Syndrome, Which of the Following Statements Is

question 493

Multiple Choice

Regarding fragile X syndrome, which of the following statements is TRUE?

• A)Fragile X syndrome is a sex-linked hereditary condition.
• B)Fragile X syndrome results from a lack of an important enzyme and is linked to very low levels of dopamine.
• C)Fragile X syndrome is a condition caused by an extra chromosome at pair 21.
• D)Fragile X syndrome results from an insufficient supply of thyroid hormone.

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Definitions:

Ortho

In chemistry, a designation used in nomenclature to indicate adjacent or 1,2- substitution in the structure of benzene ring compounds.

Para

In organic chemistry, this term refers to the positioning of substituents on an aromatic ring where two groups are separated by two carbon atoms, leading to a 1,4-relationship.

Bromination of Benzene

A chemical reaction where bromine is added to benzene, typically requiring a catalyst like iron bromide, to form bromobenzene.

Carbanionic Intermediate

A transient species in organic chemistry featuring a carbon atom bearing a negative charge; it plays a crucial role in various chemical reactions.