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.
ATT Validity Dates. 1  Each ATT is valid for a period of time specified by the BON/RB (the average length of an ATT is 90 days). 2  Once the BON/RB has declared you eligible to test and you receive your ATT, you must test within the validity dates on the ATT.
You must complete the NCLEX within 12 months of your first attempt at the test. If you fail the test, you will have to wait for 45 days before you can retake the test.You will typically be able to test up to 3 times per year. If you fail the test 3 times, you will have to complete an educational program that is acceptable to the board before you are approved to take the test up to 3 times more.ou must complete the NCLEX within 12 months of your first attempt at the test. If you fail the test, you will have to wait for 45 days before you can retake the test.