Consider a peptide chain of 4 monomers. Two monomers at the ends are of type $A$ and the two in the middle are of type B. For simplicity, imagine that the peptide lives on a two - dimensional lattice with each monomer occupying one lattice cite. As a "toy" model, we consider the peptide "folded" when the two A monomers are next to each other (in adjacent cites of the lattice).

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∻Answer∻ ⚹ The peptide is considered "folded" when the two A monomers are adjacent to each other on the lattice. ⚹ ∻Solution∻ ‖ a ⋮ Define the peptide chain ⋮ The peptide chain consists of four monomers: A-B-B-A. ‖ ‖ b ⋮ Define the "folded" state ⋮ The peptide is "folded" when the two A monomers are next to each other on the two-dimensional lattice. ‖ ‖ c ⋮ Possible folded configurations ⋮ On a two-dimensional lattice, the A monomers can be adjacent in several ways, such as horizontally or vertically. ‖ ∻Key Concept∻ ⚹ Peptide folding on a lattice ⚹ ∻Explanation∻ ⚹ In this simplified "toy" model, the peptide is considered folded when the two identical monomers (A) are adjacent to each other, which can occur in multiple configurations on a two-dimensional lattice. ⚹◊What is the probability of the peptide chain folding correctly on the 2D lattice based on the arrangement of the monomers?⍭ Generate me a similar question◊

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