Bio DNA Part 1

DNA is composed of…

4 types of nucleotides

DNA is a long _____ __composed of__ ________ called nucleotides

polymer, monomers

Each nucleotide as _____ parts

3

What are the three parts?

Phosphate group, deoxyribose, nitrogen-containing base

How did Erwin Chargaff change thinking?

By analyzing the DNA in different organisms

All DNA found in any organism has…

the same 4 bases

What was different about the 4 bases from organism to organism?

The proportions

A+____,C+____

t, g

what is Chargaff’s Rule?

A=T, C=G

Who developed accurate model of DNA’s 3-dimentional structure?

Watson and Crick

Who were the first scientists to suggest the DNA had a helical shape?

Rosalind Franklin and Maurice Wilkins

DNA is a…

Double Helix

DNA strands are…

complimentary

Nucleotides always pair in…

the same way

Covalant bonds connect…

the sugar of one nucleotide to the phosphate of another