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 will have 5 hours in which to complete the exam. This includes the time set aside for the introductory computer tutorial and for two 10-minute breaks. The NCLEX examination is scored once by the computer on which you are taking it, and a second time by the National Councilâs testing service.