To make an object go round in a circle, we must exert a force that pulls it towards the centre of the circle. This force is called the centripetal force. If the object is a container, any object within the container experiences a force of F = mω2r                     (1) that pushes it away from the… Continue reading 21.13 Centrifugation

Before you read this, I suggest you read post 21.2. Most people who are interested in science know that the DNA molecule is a double helix. But what does this mean? How do we know? And why is it important? By the early 1950s, there was evidence that genes were made of DNA and that… Continue reading 21.12 The DNA double helix