DNA Flashcards
where are genes carried?
chromosomes
what happens when heat killed pathogenic cells are mixed with non-pathogenic cells?
pathogenic transfer to healthy cells
what is the pre-1940s view on proteins and DNA?
heterogenous macromolecule
polymer with uniform chem properties; boring
what are bacteriophages?
viruses with DNA enclosed in a protective shell
what technique is used to study molecular structure?
x-ray crystallography
where does DNA repliaction begin?
replication site where a ‘bubble’ is opened
what is the replication fork?
edge of bubble- y shaped
what is helicase enzyme?
unwinds double helix
what are single stranded binding molecules?
bind to stabilize sing stranded DNA
what is topoisomerase?
relived strain of twisting of double helix by breaking, swivelling and re-joining DNA
what do primers do in DNA replication?
allow a starting point for dna polymerase
what does ligase do?
joins okazaki fragments
