DNA Semi-conservative replication Flashcards
1
Q
What enzyme unzips DNA and how does it do it? (First stage of replication)
A
- DNA Helicase
- Breaks hyrdogen bonds between complementary bases
2
Q
What happens in the second stage after DNA has been unzipped?
A
Free nucleotides are attracted to the exposed bases by complementary base pairing
3
Q
What enzyme joins nucleotides to complementary bases, through what bonds, and to form what?
A
- DNA polymerase
- Phosphodiester bonds
- Forms a sugar-phosphate backbone
4
Q
Using the fourth and final step, explain why this replication is semi-conservative
A
- Each DNA molecule has 1 old and 1 new strand
