Which regions of a Ramachandran plot can glycine adopt permissible bond angles, and what is the implication of this flexibility?

• A. Glycine is restricted to the upper left quadrant, limiting its structural roles.
• B. Glycine can only adopt angles in the lower right quadrant, affecting its stability.
• C. Glycine can adopt angles in all quadrants, allowing it to fit into tight spaces in proteins.
• D. Glycine's flexibility is similar to proline, with limited permissible regions.

Answer: (C)