Hershey and Chase anticipated that they could assess the relative importance of DNA and protein in gene transmission by infecting bacterial cells with viruses called phages, short for bacteriophages.
DNA is composed of four different subunit (nucleotides) linked in a long chain. The bonds joining one nucleotides to another are covalent phosphodiester bonds.
DNase DNA destroye
Ultracen -trifugation Fat
e1iminated
Introduce into R cells
Physical and
chemical analysis
indicates predominance
of DNA
DNA
----bearer of genetic information
Under special conditions of little or no oxygen, DNA can withstand a wide range of temperature, pressure, and humidity and remain relative intact for hundreds, thousands, even millions of years.
DNA
----bearer of genetic information