Strep throat is a contagious disease caused by infection with streptococcal bacteria, which causes inflammation and swelling of the mucous membranes lining the back of the throat and the tonsils.trep throat is a contagious disease caused by infection with streptococcal bacteria, which causes inflammation and swelling of the mucous membranes lining the back of the throat and the tonsils.
Once an egg cell is fertilized by a sperm, it will divide and become an embryo. In the embryo, there are stem cells that are capable of becoming all of the various cell types of the human body. For research, scientists get embryos in two ways. Many couples conceive by the process of in vitro fertilization. In this process, a couple's sperm and eggs are fertilized in a culture dish.
A Typical Cell. To discover what each part of the cell does, move your mouse pointer over it. A fertilized egg is the result of a women's ovum uniting with a male sperm.While there are unique features of a fertilized egg, this first cell of life is also typical of the billions of cells that will eventually make up the human body. Typical Cell. To discover what each part of the cell does, move your mouse pointer over it. A fertilized egg is the result of a women's ovum uniting with a male sperm.