|
|
Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.
There are major differences in the metabolism of morphine and the illegal drug heroin. Morphine mostly produces its CNS effects through m-receptors, and at k- and d-receptors. Heroin has a slight affinity for opiate receptors. Most of its actions are due to metabolism to active metabolites (6-acetylmorphine, morphine, and morphine-6-glucuronide).
In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).
About one in five American adults and teenagers have had a genital herpes infection—and most of them don't know it. People with genital herpes have at least twice the risk of becoming infected with HIV if exposed to it than those people who do not have genital herpes.
Blood is approximately twice as thick as water because of the cells and other components found in it.
![Ice-wedges form netlike polygons on the surface of the tundra, aerial photo of polygonal peat platea](https://biology-forums.com/gallery/47/medium_33_27_08_11_11_56_24_15472357.jpeg)
![Varicella or chickenpox, a viral skin infection. In this photograph, the rash is beginning to form s](https://biology-forums.com/gallery/47/medium_14755_16_09_12_6_01_25_87781652.jpeg)