1 answer
(click or scroll down)
1. **Gene**: A section of DNA that encodes a specific protein.
2. **Protein**: A large molecule that performs a specific function in biological processes.
3. **Centromere**: A point that joins two halves of a chromosome.
4. **Chromatid**: A structure that contains one half of a duplicated chromosome. (Note: If you meant something broader, it might be **Chromosome**, which is a structure that contains many genes and is found in the nucleus of eukaryotic cells.)