In the classic experiment with mice, Griffith first discovered that bacteria can acquire new genes during their lifetime. a. True
b. False

True

Transformation is the process through which bacteria acquire new genes.These new genes are the genetic information that the bacteria transfer from one to another.

Griffth based his discorvery on the development of Vaccine for pnuemonia.He made use of two strains of the bacteria.The non-virulent II-R strain and the virulent III -R  strain.

He killed the III -R strain by exposing the bacteria to heat radiation.Then  added them  to the non-virulent III bacteria strain.(note non of these is pathogenic to the mice-host).

However,when the mixture was injected into the mouse,it was realized that the host developed pneumonia. He isolated the two strains of bacteria  from the host.

Therefore,if the II-strain was non virulent when injected into the host and the virulent III-strain has been deadened,definitely the virulence of III-strain must have  transformed the non virulent II  to  make it lethal and therefore   cause pneumococcal  in the host.

This virulent characteristic were confined in the DNA of the lethal III -strain,and were transformed to the non virulent II-strain to become virulent.

igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.