Brain Development in a Fetus Whose Mother Contracted German Measles

question 96

Multiple Choice

Brain development in a fetus whose mother contracted German measles early in the pregnancy is impaired because the rubella virus

• A) alters chromosome number.
• B) induces an error of metabolism within brain cells.
• C) produces toxins that interfere with the chemical signals that control brain development.
• D) deletes key enzymes within the brain.
• E) alters neurotransmitter release in the neural tube.

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Definitions:

D-Aldopentose

A type of aldose sugar with five carbon atoms and has the D-configuration, which relates to the configuration of the hydroxyl group on the last asymmetric carbon atom.

Kiliani-Fischer

A chemical synthesis method used to elongate the carbon chain of sugars.

Aldohexoses

A class of monosaccharides that contain six carbon atoms and an aldehyde functional group.

Epimeric

Describes diastereomers that differ in configuration at only one stereogenic center.