quaff ( kwaf ) v. to drink heartily i offered her a sip, but she quaffed my entire soda
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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. - PowerPoint PPT PresentationTRANSCRIPT
8.3 DNA Replication
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!!
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 directreplication.
• DNA is replicated during theS (synthesis) stage of thecell cycle.
• Each body cell gets acomplete set ofidentical DNA.
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.
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
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.
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.
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?