WS: DNA ReplicationPart A: Use the following diagram to answer the questions below:
A
CG
GC
B
THE
с
CG
GC
1. Which of the labeled DNA strands are the parent strands?
2. Which of the labeled strands are newly synthesized DNA?
3. What nucleotide will be added to strand B next?
4. What nucleotide will be added to strand C next?
5. What holds the bases in strands A and B together?
6. What holds the backbone of strand A together?
DPart B: Answer the following questions
1. What is the first step in DNA replication? Which enzyme is involved in this process?
2. What enzyme matches the bases of free nucleotides to the bases on the parent strand?
3. Explain why one DNA strand grows one nucleotide at a time and the other is assembled
in short fragments.
4. If the DNA double helix were a twisted ladder, what would the sides of the ladder be
made up of?
5. What would the rungs of the ladder be made up of?
6. Complete the table by filling in the empty boxes:
Enzyme
Helicase
SSBP
Primer
Function
Glues the short fragments of the lagging strand together to form
one continuous strand
Adds DNA bases to the 3′ end of the growing strand
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