Concept 28 Some types of mutations are automatically repaired.
Roger Herriott, Stan Rupert and Sol Goodgal at Johns Hopkins (1st row; 3rd, 2nd, and 1st from right).
A researcher in Herriott's lab works in the dark.
Claud S. Rupert at the University of Texas at Dallas.
As a last resort before dying, bacteria repair DNA with their SOS system, which quickly but sloppily attempts to fix damage.
Why do you think only bacteria have the SOS system?
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Roger Herriott, Stan Rupert and Sol Goodgal at Johns Hopkins (1st row; 3rd, 2nd, and 1st from right).
DNA and proteins are key molecules of the cell nucleus.
One gene makes one protein.
A gene is made of DNA.
Bacteria and viruses have DNA too.
The DNA molecule is shaped like a twisted ladder.
A half DNA ladder is a template for copying the whole.
RNA is an intermediary between DNA and protein.
DNA words are three letters long.
A gene is a discrete sequence of DNA nucleotides.
The RNA message is sometimes edited.
Some viruses store genetic information in RNA.
RNA was the first genetic molecule.
Mutations are changes in genetic information.
Some types of mutations are automatically repaired.