DNA is extracted from human cells for a variety of reasons. With a pure sample of DNA you can test a newborn for a genetic disease, analyze forensic evidence, or study a gene involved in cancer.Try this virtual laboratory to perform a cheek swab and extract DNA from human cells.Javascript is required to view this content.ith a pure sample of DNA you can test a newborn for a genetic disease, analyze forensic evidence, or study a gene involved in cancer. Try this virtual laboratory to perform a cheek swab and extract DNA from human cells. Javascript is required to view this content.
Knee flexion means bending your leg at the knee joint, reducing the angle between your lower leg and upper leg.
Hip flexor strain - aftercare. The hip flexors are a group of muscles that help you move, or flex, your leg and knee up towards your body. A hip flexor strain occurs when one or more of the hip flexor muscles becomes stretched or torn. Hip flexors allow you to bend your knee and flex your hip. Sudden movements, such as sprinting, kicking, and changing direction while running or moving, can stretch and tear the hip flexors.