Bio 2 First Test
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19 Terms
Varying sequences of _____ can be used as evidence that DNA is a(n) ________ molecule.
bases, informational
Griffith’s experiment discovered _______ ______. How?
bacterial transformation, the living non-virulent cell interacted with the dead virulent cell.
In which experiment was a living R-strain (non-virulent) mixed with a dead S-strain (virulent), where it was found to be deadly to the mouse?
Griffith’s experiment
T or F: Griffith’s mouse would live if an active R-strain mixed with a dead S-strain.
False
In ______’s Experiment, the researcher mixed the living R strain and dead S strain into a filtrate and used RNase, protease, and DNase looking to discover what?
Avery, whether bacterial transformation involves RNA, proteins, or DNA
Which experiment convinced the science world that DNA stores genetic material?
Hershey-Chase Experiment
The Hershey-Chase found _______ in the pellet (mixed with bacteria) and ______ in the supernatant fluid (not mixed with bacteria).
phosphorus, sulfur
Chargaff’s equation
A+G=T+C
Phosphorus interacting with the bacteria in the Hershey-Chase experiment showed what, regarding bacterial transformation?
Bacterial transformation occurs with DNA, not proteins.
What scientist used x-ray crystallography to discover DNA’s helix shape?
Rosalind Franklin
Watson and Crick found Franklin’s model and discovered what 3 things?
Sugar-phosphate backbone on the outside, nucleotide bases on the inside, double-stranded and antiparallel pattern
DNA has ______ bonds in the backbone and ______ bonds on the inside.
phosphodiester, hydrogen
How many hydrogen bonds to A and T make?
2 bonds
How many hydrogen bonds do C and G make?
3 bonds
Where are the two bonds found involving base pairs in DNA?
Hydrogen and van der Waals
True or false: Hydrogen and van der Waals forces provide consistent structure and protect the DNA from genetic errors.
True
What feature of DNA allows room for more proteins to interact with DNA?
Major and minor grooves
What did the Meselson-Stahl experiment discover?
That DNA replicates semiconservatively
After 20 minutes, Meselson and Stahl saw that half the DNA was ______ and half was _______.
intermediate, light