antiparallel

Running counter directions

Antiparallel describes lines or vectors that run parallel but point in opposite directions.

In molecular biology, the term is essential for describing DNA's double helix, where the two strands run in opposite orientations—one 5' to 3', the other 3' to 5'.

The concept appears in physics, chemistry, and mathematics wherever directional opposition matters: The magnetic moments are antiparallel.

DNA

strands

Twisted filaments or elements

nucleotides · Watson-Crick · replication · adenine · thymine · cytosine · guanine · backbone · transcription · polymerase

proteins

pleated

Having pressed folds

residues · conformation · folding · strands · amino acids

vectors

opposite

Reverse or contrary thing

aligned · coordinate · projection · axis · plane · coplanar · collinear · displacement · resultant

magnetism

spin

Rapid rotation around axis

alignment · domain · lattice · exchange interaction · susceptibility · Néel temperature · ordering · dipole · flux · polarity

Opposites
geometric orientation

antiparallelparallel

Equidistant at all points

colinear · aligned · unidirectional · tandem · perpendicular

angular relationship

antiparallelparallel

Equidistant at all points

perpendicular · orthogonal · oblique · transverse · skew

Family

parallel, parallels, antithesis, parallelism, antithetical, antipode, parallelogram, parallax, antithetic

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