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23 Cards in this Set
- Front
- Back
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Explain the work of Hersey and Chase.
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THEY USED RADIOACTIVE ISOTOPES TO TRACK MATERIAL FROM VIRUSES TO BACTERIA
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Define transformation
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ONE STRAIN OF BACTERIA CHANGES INTO ANOTHER
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What are the 3 things that make up a nucleotide?
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NITROGENOUS BASE, SUGAR (DEOXYRIBOSE) AND PHOSPHORUS.
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What was Rosalind Franklins contribution to the understanding of DNA?
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SHE USED XRAY DIFRACCTION TO TO TAKE A PIC OF DNA REVEALING AN X LIKE STRUCTURE.
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What was the contribution of Watson and Crick?
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THEY CONSTRUCTED A 3D MODEL OF DNA
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Explain Chargoffs rules.
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FOR EVERY ADENINE THERE IS THYMINE
FOR EVERY GUANINE THERE IS CYTOSINE. |
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Where is the DNA located at in prokaryotes vs eukaryotes?
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PROKARYOTES DNA IS FOUND IN THE CYTOPLASM
EUKAYOTES IT IS FOUIND IN THE NUCLEUS |
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What is the enzyme to build a new DNA molecule?
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DNA POLYMERASE
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Draw the picture of a typical DNA molecule.
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(draw)
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What kind of bonds hold the bases together? The Nucleotide?
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BASES ARE HELD WITH HYDROGEN BONDS
NUCLEOTIDES ARE HELD TOGETHER WITH COVELENT BONDS |
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Describes Avery’s work regarding DNA.
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AVERY ADDED SUBSTANCES THAT BROKE DOWN DIFFERENT MOLECULES IN A CELL. IT WAS NOT UNTIL HE DESTROYED THE DNA THAT HE WAS ABLE TO STOP TRANSFORMATION.
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What is a replication fork?
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THE POINT IN THE DNA STRAND THAT HAS UNWINDED AND IS THE SITE OF DNA REPLICATION
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What does it mean that DNA strands are antiparallel?
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THEY RUN IN OPPOSITE DIRECTIONS SO THAT NITROGENOUS BASES MAY PAIR UP.
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Whats the main difference between DNA replication in a prokaryote vs eukaryote?
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PROKARYOTE REPLICATION STARTS AT SINGLE POINT
EUKARYOTIC IS OVER MULTIPLE POINTS |
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Define telomeres.
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THEY ARE THE CAPS ON CHROMOSOMES THAT PREVENT DNA FROM UNWINDING LIKE THE PLASTIC CAPS OF SHOE LACES. THIS PREVENTS DAMAGE TO THE DNA.
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What are the 3 roles of DNA?
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STORING, COPYING AND TRANSMITTING INFORMATION
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What are the 4 bases found in DNA?
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Thymine, guanine, adenine, cytosine
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What 3 things make up a nucleotide?
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A sugar (ribose or deoxyribose)
A phosphate A nitrogenous base |
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If the original DNA strand is composed of 2 old strands, after division, the newly created DNA would have one _______ strand and one ________ strand.
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Old; New
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What happened when Griffith mixed heat killed disease causing bacteria with live harmless bacteria?
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The mice developed pneumonia and died
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What did Avery’s experiment tell us about transformation?
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DNA is the cause of transformation
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When do the DNA molecules become tightly packed?
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During mitosis
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According to the principles of ________________ adenine will always bind to thymine and guanine always binds to cytosine
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BASE PAIRING
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