The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.
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Today, nearly 8 out of 10 pregnant women living with HIV (about 1.1 million), receive antiretrovirals.
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Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.
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More than 4.4billion prescriptions were dispensed within the United States in 2016.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
Insects Under the Electron Microscope
Scorpions, Spiders and Sharks: Electron-Microscope Images
Chromosomes as captured via electron micrograph
Scanning electron micrograph of HIV-1 budding (in green) from cultured lymphocyte. This image has ...