Don't worry, it should be. Your epidermis is the top part of your skin, and your skin is your body's largest and fastest-growing organ. Skin is your body's coat. It protects you. It helps you stay warm when it's cold, and cool when it's hot. Your skin keeps all your insides in, from your heart and lungs to your blood and muscles.
In the other population of cells, the injected phage chromosome turns OFF all the phage genes except one. The single phage chromosome called the prophage now becomes a part of the host chromosome. The bacterium carrying the dormant phage chromosome is called the lysogen.
Chapter 9.  Vector  is an agent that can carry a DNA fragment into a host cell. If used for reproducing the DNA fragment, it is called a cloning vector. If used for expressing certain gene in the DNA fragment, it is called an expression vector.Commonly used vectors include plasmid, Lambda phage, cosmid and yeast artificial chromosome (YAC) .igure 9-A-4. Schematic drawing of the DNA cloning using Î» phages as vectors. The DNA to be cloned is first inserted into the Î» DNA, replacing a nonessential region. Then, by an in vitro assembly system (described below), the Î» virion carrying the recombinant DNA can be formed.