In certain proteins, expansion of a tract of which amino acid is associated with various genetic forms of progressive neurodegeneration?
A) Alanine
B) Proline
C) Valine
D) Methionine
E) Glutamine

Question

Quizplus · Accepted Answer

Expansion of a tract of glutamine (due to CAG repeat expansion in the DNA) is associated with various genetic forms of progressive neurodegeneration, such as Huntington's disease. This phenomenon is known as a polyglutamine (polyQ) disease.

In Certain Proteins, Expansion of a Tract of Which Amino