What is the difference between an inducible gene and a repressible gene? Give an example of each.

INSTRUCTIONS TO CANDIDATES

ANSWER ALL QUESTIONS

1. What is the difference between an inducible gene and a repressible gene? Give an example of each.

2. Define what is meant by the “redundancy” (“degeneracy”) of the genetic code. What is the advantage of the redundancy (degeneracy) of the genetic code?

3. Compare and contrast gene expression in prokaryotes and eukaryotes.

4. As a result of a substitution mutation, a DNA base triplet AGA is changed to AGG. State specifically what effect this would have on the resulting protein and state what type of mutation it would result in. Show your work.

5. A third triplet in a bacterial gene is TTT. A substitution mutation changes it to ATT. State specifically what effect this would have on the resulting protein and state what type of mutation it would result in. Show your work.

6. Explain the difference between the vertical and horizontal transmission of genetic traits.

7. Which of the methods of horizontal gene transfer requires contact between donor and recipient? Explain the specifics.

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