Nucleic acid

nucleus of living cell is responsible for..

for the transmission og inherent characters also called heridity

chromosomes are made up of

proteins and nucleic acids

two main types of nucleic acid

deoxyribonucleic acid and ribonucleic acid

nucleic acids are long chain polymers of what

nucleotides and hence called polynucleotides

In DNA sugar moiety is

beta-D-2-deoxyribose

In RNA sugar moiety is

beta-D-ribose

Complete hydrolysis of DNA or RNA yeilds

Pentose sugar, phosphoric acid and nitrogen containing heterocyclic compounds

four bases in DNA

adenine, guanine, cytosine, thymine

four bases in RNA

adenine, guanine, cytosine, uracil

nucleoside

sugar + nitrogenous base

Nucleotide

Nucleoside +phosphoric acid

Nucleotides are joined together by

Phosphodiester linkage between 5’ and 3’ C of pentose sugar

who gave double helix structure of DNA

watson and crick

Primary structure

information regarding the sequence of nucleotides in chain of nucleic acid

Three type of RNA molecules

• mRNA

• tRNA

• rRNA

secondary structure of RNA

helices are present which are only single stranded BUT sometimes they fold back and form a double helix