Final Exam Powerpoints Questions and Correct Answers the Latest Update
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Frederick Griffith, 1928
didnt discover DNA.
He injected mice with R and S (S=virulent).
Then. He injected mice with living type R and heat-killed type S bacteria into the mouse.
The living type R cells have been transformed inti virulent type S cells!
A transforming substance for the S ...
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Final Exam Powerpoints Questions and
Correct Answers the Latest Update
Frederick Griffith, 1928
✓ didnt discover DNA.
✓ He injected mice with R and S (S=virulent).
✓ Then. He injected mice with living type R and heat-killed type S bacteria into the mouse.
The living type R cells have been transformed inti virulent type S cells!
✓ A transforming substance for the S trait was passed feom S to R cells.
Avery, MacLeod and McCarty, 1944
✓ They showed that the transforming substance was DNA.
✓ -They purified any cells transddormed from R--->S and found that the transforming
substance was DNA.
Viruses inject something into cells to program them to make more viruses
✓
Hershey and Chase discovered that viruses inject DNA, 1952
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✓ DNA is double stranded. The bases in ssDNA specifies the sequence of complementary
bases in the 2nd strand.
✓ BASE PAIRS ARE SECURED WITH H BONDS.
✓ purines complementary to pyrimidines and that the two strands are antiparallel- one
strand is upside down to the other.
DNA replication overview
✓ DNA replication is semiconservative.
✓ DNA is made in a 5 prime to 3 prime direction, antiparallel to its template strand. A
leading strand is made continuously, a lagging strand is made discontinuously.
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