There are two models of protein folding that are currently being confirmed: 1  The diffusion collision model, in which a nucleus is formed, then the secondary structure is formed, and finally these secondary structures are collided together and pack tightly together.
If you do not test within these dates you will have to reregister and repay the examination fee. The ATT contains your authorization number, candidate identification number and an expiration date. You need the ATT to: Schedule an appointment to take the NCLEX examination.
1 The NCSBN most recently updated its criteria for the NCLEX-PN at the end of 2007, with the standards taking effect in early 2008. That means the standards will be up for revision once again in late 2010 to early 2011.  The NCSBN estimates only 86 percent of first-time test-takers pass the NCLEX-PN. If you fail on your first attempt, you may retake the examination a minimum of 45 to 90 days after your first exam.