nucleic acid strucute Flashcards
what are the two types of nucleic acid
DNA
RNA
what atoms are nucleic acids composed of
CHONP
what is the monomer of nucleic acid
nucleotides
what are nucleotides made up of
pentose sugar - ribose or deoxyribose
organic nitrogenous base ACTG
phosphate group
covalent bonds
what is a purine
type of base made of 2 carbon nitrogen rings
adenine
guanine
what is a pYrimidine
base of just 1 carbon nitrogen ring
thYmine
cYtosine
uracil
what is the structure of a polynucleotide
nucleotides join by condensation reaction to form polynucleotide
between nucleotides is a phosphodiester bond forming sugar phosphate back bone
when do nucleic acids form and how
when 2 polynucleotide chains join together by H bonds between nitrogenous base
purine to pyrimidine to allow H bonds
- very stable
- same width
strands are antiparallel
how many h bonds does each base pair have between
AT has 2
CG has 3
how does double strand dna form
