how does DNA work? Flashcards
what is a nucleotide made of?
phosphate, sugar and a base
4 bases
Adenine, Thymine, Guanine, Cytosine
Chargaff’s rules
he found that the amount of adenine is always equal to the amount of thymine and guanine is always equal to the amount of cytosine
how did Franklin discover the images of the DNA molecules
x ray diffraction
Frankie’s discovery suggested that
DNA is a spiral shape
what are the rungs of the DNA ladder made of
adenine, thymine, cytosine, guanine
what is the subunit of DNA
nucleotides
why should DNA be copied
DNA should be copied so that it can determine the traits that the organism inherits and needs to live
the pairing of the bases allows the cell to?
replicate or make copies
Both sides of DNA molecules are
complimentary
where does the molecule spilt during replication?
down the middle
the twisted ladder of DNA is called
double helix
what two things does a cell need to do
give instructions accurately and be copied each time the cell divides
what part in the cell does it help unwind copy and rewind
proteins
how often is DNA copied
every time a cell divides
after a DNA molecule spilts what is added to each side of the ladder?
complimentary nucleotides are added
