An object having a three-dimensional shape like that of a wire wound uniformly in a single layer around a cylinder or cone, as in a corkscrew or spiral staircase
the teacher's crude drawing of a DNA double helix
One of the two common conformations of the secondary structure of proteins, in which the polypeptide chain assumes the form of a straight, tightly coiled helix, stabilized by hydrogen bonding between carbonyl and amide groups in the peptide linkages of the chain.
A pair of parallel helices intertwined about a common axis, especially that in the structure of the DNA molecule
= resistance coil.
A woody evergreen Eurasian climbing plant, typically having shiny, dark green five-pointed leaves
A large snail which is widely collected or cultured for food, occurring chiefly in southern Europe
A large European snail with a brownish shell, often abundant in gardens