DNA Structure And Replication Flashcards
RNA primase
Leaves RNA primers on the lag strand
DNA polymerase III
Attatched to nucleotides in a 5’ to 3’ direction
RNA primers
Initiation sites for DNA polymerase III on the lag strand
Okazaki fragments
Sections of new DNA on the lag strand
DNA polymerase I
Removes RNA primers
DNA ligase
Attatches Okazaki fragments together
What does DNA is semi conservative mean?
One strand is parent and one is new
DNA helicase
Separates base pairs
In what direction does DNA polymerase I move?
Along the replication fork, removing RNA primers
Purines
Adenosine and guanine
Pyramidines
Thymine and cytosine
Three parts of DNA
- Deoxyribose 5carbon sugar
- Nitrogen base
- Phosphate
Bonds between three parts of a single nucleotide
Covalent
Bonds between other nucleotides
Hydrogen
Nucleotide
The single unit in DNA
What bonds link carbons 3’ and 5’?
Covalent
Anti parallel
Opposite directions
Histone protiens
Allow DNA to be supercoiled
Nucleosomes
Hold the DNA together to form the frame of chromosomes
Exons
Exit nucleus
Introns
Stay in nucleus
