Final answer:
In a 2D representation, tRNA molecules are depicted as a cloverleaf shape, which simplifies the complex structure involving loops and base pairs.
Step-by-step explanation:
In a 2D representation, all tRNA molecules appear as a cloverleaf shape. This structure results from intramolecular base pairing, which creates loops and double-stranded portions giving rise to the characteristic cloverleaf form. Although the 3D structure of tRNA is L-shaped, when represented in two dimensions, the cloverleaf model is commonly used to depict the organization of the tRNA molecule, with specific areas like the anticodon arm recognizable in this form.