2. Nucleic Acids
• Nucleic acids are molecules that store information for cellular
growth and reproduction
• There are two types of nucleic acids:
- deoxyribonucleic acid (DNA)
-ribonucleic acid (RNA)
• A nucleotide consists of a nitrogenous base, a pentose sugar
and a phosphate group:
5. Pentose Sugars
• There are two related pentose sugars:
- RNA contains ribose
- DNA contains deoxyribose
• The sugars have their carbon atoms numbered with primes
to distinguish them from the nitrogen bases
8. DNA (Hereditary material)
• Griffith
• None virulent bacteria->Virulent bacteria.
• Hershy and Chase
• Bacteriophage-DNA-Host-more phages.
• All nucleotides of DNA, phosphate and
deoxyribose sugars are always common but
nitrogenous bases are different.
• Each DNA has specific sequences of nitrogenous
bases. It encodes vaste amount of information