The Helix-Loop-Helix (HLH)motif Is Often Preceded by a Stretch of Highly

Multiple Choice

The helix-loop-helix (HLH) motif is often preceded by a stretch of highly ______ amino acids whose ______ charged side chains contact DNA and determine the transcription factor's sequence specificity.

A) basic, positively
B) basic, negatively
C) acidic, negatively
D) acidic, positively
E) hydrophobic, neutral