DNA Replication

Question 1

DNA Replication - Step 1

Answer 1

Enzyme DNA helicase unzips helix of double-stranded DNA by breaking hydrogen bonds between nucleotides
Nitrogenous bases exposed
Happens along a small section at a time

Question 2

DNA Replication - Step 2

Answer 2

Replication fork - junction between unwound single strands of DNA and intact double helix
Moves along parental DNA strand, continuous unwinding

Question 3

DNA Replication - Step 3

Answer 3

Stockpiles of free nucleotides within nucleus attach to exposed bases according to base pairing rule
Helped by enzyme DNA polyamerase

Question 4

DNA Replication - Step 4

Answer 4

Enzyme DNA ligase seals new short stretches of nucleotides into continuous strand that rewinds

Question 5

DNA Replication outcome

Answer 5

2 double helix DNA molecules
Each consists of one parental strand & one new strand
Semi conservative process - one retained while other is new