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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.
Each chromosome consists of one continuous thread-like molecule of DNA coiled tightly around proteins, and contains a portion of the 6,400,000,000 basepairs (DNA building blocks) that make up your DNA.The way DNA is packaged into chromatin is a factor in how protein production is controlled.ach chromosome consists of one continuous thread-like molecule of DNA coiled tightly around proteins, and contains a portion of the 6,400,000,000 basepairs (DNA building blocks) that make up your DNA.