QUAFF ( kwaf ) v. to drink heartily I offered her a sip, but she QUAFFED my entire soda.
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Transcript of QUAFF ( kwaf ) v. to drink heartily I offered her a sip, but she QUAFFED my entire soda.
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8.3 DNA Replication
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8.3 DNA Replication
QUAFF (kwaf) v. •to drink heartily
– I offered her a sip, but she QUAFFED my entire soda. – Fraternity parties often involve the QUAFFING of large
quantities of beverages. – Many of the senior citizens were guilty of QUAFFING far
too much drink at the early bird special.
PLEASE HAVE YOUR INB OPEN TO YOUR HOMEWORK FROM LAST NIGHT!!
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8.3 DNA Replication
KEY CONCEPT DNA replication copies the genetic information of a cell.
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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 directreplication.
• DNA is replicated during theS (synthesis) stage of thecell cycle.
• Each body cell gets acomplete set ofidentical DNA.
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8.3 DNA Replication
Proteins carry out the process of replication.
• DNA serves only as a template. • Enzymes and other proteins do the actual work of
replication.– Enzymes unzip the double helix.– Free-floating nucleotides form hydrogen bonds
with the template strand.nucleotide
The DNA molecule unzips in both directions.
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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 polymerase
new strand nucleotide
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8.3 DNA Replication
• DNA replication is semiconservative.
original strand new strand
Two molecules of DNA
• Two new molecules of DNA are formed, each with an original strand and a newly formed strand.
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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.
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8.3 DNA Replication
On the BACK of your notes:
1. Guanine, cytosine, thymine, and __________________ are the four __________________ in DNA.
2. In DNA, guanine always forms hydrogen bonds with __________________.
3. The process of __________________ produces a new copy of an organism’s genetic information, which is passed on to a new cell.
4. The double coiled, “staircase” shape of DNA is called a __________________.
5. What is the first step in the process of DNA replication?
6. Which enzyme is responsible for facilitating the hydrogen bonding between nucleotides in a new DNA molecule?
7. If the sequence of one single strand of DNA is C-A-A-G-T-A-G-G-C-, what is the sequence of the complementary strand?