1.5.2 DNA Replication

Question 1

What type of replication is DNA replication

Answer 1

Semi-conservative

Question 2

Each new double helix created from DNA contains what strands

Answer 2

• One original strand (template strand)
• One new strand

Question 3

What does DNA replication ensure for species

Answer 3

Continuity of genetic information between generations

Question 4

New strands are what to template strands in DNA replication

Answer 4

Anti-parallel

Question 5

How are nucleotides linked in DNA replication

Answer 5

5’ to 3’

Question 6

Describe the process of DNA replication

Answer 6

• DNA helicase breaks hydrogen bonds between complimentary base pairs
• This allows the unwinding of the DNA double helix
• Strands seperate, and both strands are used as templates
• Free DNA nucleotides are attracted to and allign with exposed bases, forming complimentary base pairs
• Adenine and thymine, cytosine and guanine
• DNA polymerase catalyses the condensation reaction between adjacent nucleotides, forming phosphodiester bonds
• Nucleotides added 3’ end of strand
• Strands coil into double helix - one parent and one new strand
• Replication is semi-conservative

Question 7

What scientists investigated DNA replication

Answer 7

Watson and Crick

Question 8

Draw the results shown by Watson and Crick by coloured lines

Answer 8

Question 9

What would the results of Watson and Crick look like, if they were spun in a centrifuge

Answer 9