AQA BIO2 Chapter 1
- Made up of a pentose sugar called deoxyribose.
- Phosphate Group has a negative charge so DNA can be seperated.
- The base of a nucleotide can be any one of 4
- Adenine and Guanine are Purines.
- Cytosine and Thymine are Pyrimidines
Single nucleotides undergo a condensation reaction to form a phosphodiester bond between the phosphate group of one nucleotiode and the deoxyribose sugar of another nucleotide, when this occurs between several nucleotides a polynucleotide strand is formed
A Sugar Phosphate Backbone is formed between the pentose sugars and the phosphate group.
bases only pair if they are complementary, hydrogen bond form between complementary bases
A=T require 2 hydrogen bonds.
G≡C requires 3 hydrogen bonds.
Base pairs involve 1 purine base and 1 pyrimidine base.
comprised of 2 polynucleotide strands that run anti-parralel to each other, each strand has bases that are complementary to the other strand
hydrogen bonds hold the two strands together.
5' end is when the…