It is present in every cell and is closely packed within chromosomes in the nucleus of each one. Traits are coded for by segments of DNA, or genes. DNA has a double helix structure. Imagine it as a twisted ladder.
Because it includes the instructions required for an organism to grow, develop, survive, and reproduce, DNA is known as the "blueprint of life." DNA achieves this by regulating the synthesis of proteins.
Presumptive tests establish either that a sample absolutely does not contain a specific substance or that a sample may contain a specific substance. Keep in mind that this is only a speculative test; there is no way to positively identify a drug using a speculative test.
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