Cocaine users are often stopped for drug test to ensure that they are sober.
The immune system is the body's defense against infectious organisms and other invaders. Through a series of steps called the immune response, the immune system attacks organisms and substances that invade body systems and cause disease.
The immune system is made up of a network of cells, tissues, and organs that work together to protect the body. One of the important cells involved are white blood cells, also called leukocytes, which come in two basic types that combine to seek out and destroy disease-causing organisms or substances.
Heterozygotes are genes that carry contrasting inheritance
factors. Each human body is composed of genes, and these usually come in pairs
that are slightly different from each other. The different versions of genes
are called alleles. Alleles are responsible for determining physical or notable
characteristics and traits a specific person has.
For example, if your mom has
a set of regular brown eyes and your dad has a set of blue eyes, you are most
likely to get a dominant trait from either of them.
<span>A heterozygote gene is basically two copies of DNA that are a
mix of two different alleles that come from your parents.</span>