DNA Replication

Question 1

Why does DNA replicate?

Answer 1

So cells have the full amount of DNA

Question 2

How does DNA replicate?

Answer 2

1. DNA helices breaks the hydrogen bonds
2. Each strand acts as a template
   Free floating DNA nucleotides are attracted to their complementary base pairs
3. Condensation joins them together
   Catalysed by DNA polymerase

Question 3

What is meselson and stahls experiment?

Answer 3

1. 2 samples of bacteria grown
   One in a light nitrogen broth one in heavy nitrogen broth
2. Sample of DNA from each one was spun in a centrifuge
   Heavy settled lower
3. Heavy nitrogen DNA were put in light nitrogen
   One round of replication
   Spun in centrifuge
   Settled between light and heavy