常速英语

Keywords:

The virus is derived from a typical cold virus, called an adenovirus. It infects, or begins to infect all cells. If the virus infects a normal cell, the DNA from the virus will get out of it and go to...

Keywords:

When temperatures drop and the days get shorter, many animals wait out winter by hibernating or migrating to warmer climates. But honey bees do something a little different to stay cozy. They hu...

Keywords:

So here's a figure of this, here's the per gene, here's its promoter. There's a ribosome, and this gene is now active, illustrated by this glow and the gene is producing messenger RNA which is being t...

Keywords:

This is the ocean twilight zone. More than 30 metres below the surface, coral reefs still flourish in the gloom. But these deep reefs could be under threat from a powerful force: Hurricanes. Scient...

Keywords:

So imagine this yellow portion is the portion where the tri-nucleotide repeat is, and as you know helicases open the DNA, the DNA polymerases copy it. So we're going to watch that repeat now get throu...

Keywords:

As sea levels rise, hundreds of millions of people around the world will have to move to higher ground. The reality is that we can't hold back the water by surrounding ourselves with walls, and in...

Keywords:

There's a polymerase, a DNA polymerase, which copies both strands of the DNA, the top strand and the bottom strand. Sometimes those two strands are called Watson and Crick strands. But they're not per...

Keywords:

You’ve heard the numbers: More than half of the world’s people now live in cities, and in just a few decades more than two thirds of the globe’s rapidly growing population will be urban. Because citie...