2. In this chapter, you learned that some pathogens must attach to host cells to cause disease. To accomplish this, molecules on their surface (adhesins or ligands) recognize and attach to molecules (receptors or integrins) on the surface on certain host cells.
So a chromatic note, is any note you play that is not in the scale you are playing. They are also a great way to practice, especially if you are going through the pentatonic scale. Try adding one of these outside chromatic notes to your scale, and see how it sounds above the chord you are playing over.
The frequencies of notes that are a 'perfect' fifth apart are in the ratio of 1.5, exactly. G is seven chromatic steps above C, so, using the 12th root of 2, the ratio between G and C on either standard scale is (12th root of 2)^7 = 1.49830707688, which is slightly less than the 1.5 required for a perfect fifth.