Structure and replication OF DNA Flashcards
how is DNA SHAPED
DNA is shaped in a double helix
what is each stand of DNA made up from
chemical units called nucleotides
what is a nucleotide made up of
three
- deoxyribose sugar
- a phosphate
- base
How are base pairs her together
weak hydrogen bonds
how many carbon atoms do deoxyribose molecules have
5
sugar phosphate back bone what is it
It has a 3’ end that starts with a deoxyribose molecules and a 5’ end that finishes with a phosphate
what way do the DNA strands move
Run in opposite direction sand said to be anti parallel to each other
what is replication
Where DNA molecules can directly synthesis identical copies of themselves
what do you need for replication
tempalte strands supply of DNA nucleotides primers the enzymes DNA poly mearse and glass and ATP
what is a primer
A short complementry strand of nucleotides
What is PCR
It amplifies DNA using complementary primers for specific targets sequences
what are primers in PCR
they are short strands on nucleotides that are complemntry to speififc targets sequences st the two 3 ends of the region of the DNA to be amplified
What does a cycle of PCR
A cycle of PCR doubles the number of copies of a reign to DNA
What does a PCR help with
solve crimes solve paternity disputes
