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DNA is in an incredible structure. This tightly coiled molecule houses the genes that an organism needs to grow and survive, and packing them all inside a cell's nucleus is an incredible feat. slide 1 of 2. The DNA length varies in different organisms. The DNA of a virus may be as small as a few thousand base pairs. However, the DNA of E. coli, a bacterium has 4 million base pairs and the human genome contains 6 billion base pairs. In general, the more complex the organism, the greater the DNA content in its cells.
Eukaryotic chromosomes contain both DNA and protein tightly packed together to form Chromatin. Chromatin consists of DNA tightly coiled around histones. DNA and histone molecu â¦ les form nucleosomes. These are all part of the structure of chromosomes. Cell Biology: The Translation and Use of Protein Most people know to some extent that DNA is the foundation for life. 2  It is the code at the heart of everything that happens in an organism. 3  However, not many people know how â¦.