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Which particles are moving by diffusion across the membranes? Dots in both models are moving by diffusion across the membrane. Diffusion is the net movement of molecules from an area of (low/high) concentration to an area of (low/high) concentration. high.Notes for POGIL Protein Structure; AP Bio Learn with flashcards, games, and more — for free.Notes for POGIL Protein Structure; AP Bio Learn with flashcards, games, and more — for free.The sequence of RNA is translated into protein; thus the amino acid sequence of a protein is prescribed by the sequence of bases in the DNA. The amino …A protein is said to have primary, secondary, tertiary, and quaternary levels of structure (Figure II). The biological function and properties of a protein are directly related to its structure. 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