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.
After you register with Pearson VUE and your board of nursing declares you eligible, you will receive your Authorization to Test (ATT). All application materials and fees must be submitted to the board of nursing before they can deem you eligible to test.ou need the ATT to: 1  Schedule an appointment to take the NCLEX examination. 2  Be admitted to the test center on the day of the examination appointment. 3  Candidates will not be admitted to the examination without their ATTâs and will be required to reregister and repay to take the examination.