DNA Double Helix & Replication

Question 1

What are polynucleotides?

Answer 1

polymers made up of many nucleotide monomers joined together by a series of condensation reactions, forming phosphodiester bonds.

Question 2

DNA structure

Answer 2

DNA double helix is held together by hydrogen (H) bonds between complementary base pairs.

Question 3

How many bonds between the bases?

Answer 3

2 H bonds between Adenine & Thymine 3 H bonds between Cysteine and Guanine

Question 4

How does DNA replicate?

Answer 4

Semi conservative replication creating two molecules of DNA that consist of one original DNA strand and one newly synthesised DNA strand.

Question 5

Describe the process of Semiconservative replication

Answer 5

1. DNA helicase breaks H bonds between the two strands
2. Free nucleotides complementary base pair to the exposed strands
3. DNA polymerase catalyses condensation reactions to join adjacent nucleotides, forming phosphodiester bonds

Question 6

have a look at DNA replication diagram

Answer 6

here