Chapter 5 - quiz Flashcards
pyridamines
- single ring
1. thymine
2. cytosine
purines
- 2 rings
1. adenine
2. guanine
thymine and adenine have ___ hydrogen bonds
2
cytosine and guanine have ___ hydrogen bonds
3
3’
- OH- group attached
- continuous
- hydroxyl end
- no DNA loss
- nucleotides attach here
5’
- phosphate attached
- lagged replication of the 5’ end
- loss of DNA
DNA replication
- process of producing 2 identical DNA molecules from an original (parent) DNA molecule
- occurs during S phase of interphase
semi conservative replication
- one strand of parent DNA conserved and one is newly synthesized
- correct theory
conservative replication
forms 2 new daughter strands from parental template
dispersive
original DNA chunked and dispersed into the newly synthesized
helicase
binds to DNA and unwinds double helix
topiosomerase
relieves strain on the double helix being separated
DNA Polymerase III
catalyses addition of new nucleotides
RNA primase
adds small complementary RNA primer
DNA polymerase II
excise incorrect base
SSBP (single strand DNA binding protein)
stabilize single strand regions of DNA as it unwinds
DNA ligase
joins ends of Okazaki fragments in lagging strand
leading
DNA polymerase III builds continuous process towards replication fork (towards center of Y)
lagging
DNA polymerase III adds nucleotide away from replicationo fork but they jumps over fragments to build none as replication bubble opens