科学研究   常速英语

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This is a map of someone’s brain, showing roughly which areas respond when they hear different words. For example, there’s a small area in the middle frontal gyrus that reliably responds to hearin...

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The first method of sequencing the genetic code was devised by Fred Sanger. To sequence the DNA, it must first be separated into 2 strands. The strand to be sequenced is copied using chemically altere...

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Shotgun sequencing is the method that was used by the private genome project. Shotgun sequencing requires multiple copies of the genome, which are effectively blown up into millions of small fragments...

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Tornadoes occur in every continent, except Antarctica but more form over the central United States than anywhere else in a zone called Tornado Alley. That's because conditions in the Alley are ...

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Sickle cell anemia is a genetic disease that affects hemoglobin, the oxygen transport molecule in the blood. The disease gets its name from the shape of the red blood cells under certain conditions. S...

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The central dogma of molecular biology, DNA makes RNA makes protein. Here the process begins. Transcription factors assemble at a specific promoter region along the DNA. The length of DNA follow...

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What you are about to see is DNA's most extraordinary secret. How a simple code is turned into flesh and blood. It begins with a bundle of factors assembling at the start of a gene. A gene is simply a...

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The cells start off as a female with two X chromosomes. The cell divides and the embryo is getting slightly bigger and still each cell has both X chromosomes active, but in early embryogenesis eac...