A chromosome is made of a pair of chromatids joined by a small structure in the middle called a centromere to give it an X-like structure. The chromatids are made of long coils of DNA as well as proteins that have undergone quaternary structure (taken a well-formed 3-dimensional shape). The coils include sequences of nucleotides to make up amino acids as well as regulatory elements.
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Pronoun and speech
nucleus and nucleolus
The old and new testaments are the two parts that make up the bible.
The central nervous system is made up of two main parts: the brain and the spinal cord.
Sugar and phosphate are the parts that make up the DNA backbone.
The door and two hinges.
The house and the senate
one of it is the crust and core
Congress consists of two parts: the House of Representatives and the Senate.
house of representatives and the senate
Protons and Neutrons
Chromatids