Chapter 16 - Chapter 16 DNA is a polymer of nucleotides,...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 16 DNA is a polymer of nucleotides, each consisting of 3 components a nitrogenous base, pentose (deoxyribose), and a phosphate group Erwin Chargaff analyzed the base composition of DNA from a number of different organisms. o Reported that base combination varies from one species to another. o 30% of human DNA have the base A, where DNA from bacterium has only 26% A. o Evidence of molecular diversity among species o He noticed a peculiar regularity in ratios of nucleotide bases within a single species. Observed that number of adenines were appox equal tot number of thymines and same for cytosine and guanine Hershey Chase experiment provided powerful evidcence that nucleic acids rather than proteins are the hereditary material at least for viruses. Watson and Crick width of the helix suggested that it was made of two strands double helix. Backbone was made of sugar phosphate groups, this arrangement was appealing b/c it put the relatively hydrophobic nitrogenous bases in the molecular interior and thus away from the surrounding aqueous solution.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 2

Chapter 16 - Chapter 16 DNA is a polymer of nucleotides,...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online