9. DNA Replication

Question 1

define what DNA replication is

Answer 1

process of making two idenetical replicas of DNA from one original DNA molecule

Question 3

how does DNA replication occur?

hint: parental and daughter

Answer 3

the DNA double helix splits into two parental strands, nucelotides join the single strands to form the sugar - phosphate back bone of the daughter strands

Question 4

DNA replication can only be added onto the 3’ end of the growing chain, meaning the strands are being sythesised in the opposite direction due to the anti-parallel nature. what is the enzyme that can attach to the strands, also what are the strands called?

Answer 4

the RNA primer attaches to the 3’ end of the DNA. there is a leading strand and the lagging strand.

Question 5

name the three type of replication models, and which one is used in DNA replication

hint: con sem di

Answer 5

conservitive model, semiconservitive model and dispersive model. the semiconcertive model is used in DNA replication

Question 6

what is the enzyme that is a catalist to create DNA synthesis. how do they do this?

hint: something to do with adding ___ to a chain

Answer 6

DNA polymerases. they add nucleotides to a pre-existing chain

Question 7

what is the origin of replication site (ori site) on a DNA sequence?

Answer 7

the site where replication is initiated and the DNA is unwound

Question 8

what does the RNA primer do?

Answer 8

is a starting point for DNA synthesis

Question 9

what is the enzyme DNA helicase do?

hint: being organsied

Answer 9

it unwinds and seperates the parent DNA strand. allows each strand to be copied