Two weeks ago, you received three unknown yeast strains. One was lys- (it cannot synthesize its

Biology

1 answer:

mamaluj [8]3 years ago

8 0

Answer:

Explanation:

1) The strains LYS+ will be able to survive and grow on -lys plates because they are the only strains able to survive on medium without lysine;

2) The strain -lys will be able to survive at AA plate;

3) The genetic mechanism for the result is that some mutation caused by the UV light made one of the LYS+ strain plates to grow better because it became AA resistant;

4) The mutation caused by UV light probably inactivaded the genes responsible for the synthesis of lysine;

5) There is some level of tolerance by which some cells can survive high levels of AA, that way some cells from the pool of LYS+ strain may survive the AA plate

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