U1W3D1- Bio

Open Ended

What does the word “replication” mean?

Open Ended

Why is it important for DNA to replicate? When does this happen in the cell cycle?

8.3 DNA Replication

KEY CONCEPT

DNA replication copies the genetic information of a
cell.

8.3 DNA Replication

• Replication copies the genetic information.
• A single strand of DNA serves as a template for a new

strand.

• The rules of base pairing direct

replication.

• DNA is replicated during the

S (synthesis) stage of the
cell cycle.

• Each body cell gets a

complete set of
identical DNA.

Multiple Choice

When does DNA replication occur?

• G1 Stage

• S Stage

• G2 Stage

• Mitosis

8.3 DNA Replication

– Polymerase enzymes form covalent bonds between

nucleotides in the new strand.

– DNA polymerase enzymes bond the nucleotides together

to form the double helix.

DNA polymerasenew strandnucleotide

Multiple Choice

What are the roles of DNA Polymerase and DNA Helicase?

• Polymerase unzips the DNA, Helicase binds the nucleotides together

• Helicase unzips the DNA, Polymerase binds the nucleotides together

• Polymerase unzips the DNA and binds the nucleotides together. Helicase forms hydrogen bonds

8.3 DNA Replication

• DNA replication is semiconservative.

original strandnew strandTwo molecules of DNA

• Two new molecules of DNA are formed, each with an

original strand and a newly formed strand.

Multiple Choice

Which image correctly shows the semi-conservative model for DNA replication?

• A

• B

• C

8.3 DNA Replication

There are many origins of replication in eukaryotic chromosomes.

• DNA replication starts at many points in eukaryotic

chromosomes.

• Replication is fast and accurate.

• DNA polymerases can find and correct errors.

Open Ended

Summarize the process of DNA replication.