DNA Replication Flashcards
what is a nucleoside?
base + sugar
what is a nucleotide?
nucleoside + phosphate
what are purines and what are examples purines?
purines are two rings
examples: adenine and guanine
what are pyramidines and what are examples of water pyramidines?
pyramidines are one ring structures
examples: uracil, thymine and cytosine
what type of bond is between 3’ OH group and 5’ triphosphate?
phosphodiester bonds
what are the base pairing rules and what bonds do they have ?
A - T ( two hydrogen bonds)
C - G( three hydrogen bonds)
what direction does DNA replicate in?
5’ prime to 3’ prime direction
what catalysis DNA replication?
DNA polymerase
what kind of primer is required for DNA replication?
RNA primer
how is the lagging strand replicated?
in short fragments called okazaki fragments
what strand always has a free 3’ prime end?
the leading strand
what unwinds DNA?
helicase proteins
what are the three main classes of RNA?
rRNA
tRNA
mRNA
what’s rRNA?
ribesomalRNA
combines with proteins to form ribesomes where protein synthesis takes place
what is tRNA?
transferRNA
carries amino acid to be incorporated into protein
anti codons consist in three nucleotides
