Genes are composed of a complex molecule shaped like a twisted ladder or staircase called ______.

A) deoxyribonucleic acid
B) chorionic villi
C) zygotes
D) nuclei

Deoxyribonucleic Acid (DNA)

The chemical structure, shaped like a twisted ladder, that contains all of the genes.

Complex Molecule

A molecular structure consisting of a large number of atoms bonded together in a more elaborate and interconnected manner.

Twisted Ladder

A common metaphor used to describe the double helix structure of DNA, highlighting its two strands wound around each other.