DNA structure and replication

Question 1

DNA structure

Answer 1

a double helix consisting of two strands of monomers called nucleotides
nucleotides is composed of a deoxyribose sugar, phosphate, and nitrogenous base
the strands are complementary, hydrogen bonds always bind A with T and C with G

Question 2

DNA replication

Answer 2

DNA copies itself in s phase, and is carried out by enzymes, the enzymes helicase and gyrase catalyse the unwinding and unzipping of parent molecules

Question 3

stages of DNA replication

Answer 3

1. helicase, unzips strands
2. DNA polymerase will attach free nucleotide along the length of exposed strand 5’ to 3’ direction
3. finally DNA ligase, will bind strand together