| Criteria / Topics |
0-40 Points |
| TrpR – The trp repressor |
- 0 points: No mention of TrpR or incorrect description of its behavior.
- 20 points: TrpR is mentioned, and its behavior is correctly described (synthesized in an inactive state, activated by tryptophan binding, binds to operator site and blocks transcription).
|
| Attenuation |
- 0 points: No mention of attenuation or incorrect explanation of its mechanism.
- 20 points: Attenuation is mentioned, and its mechanism is correctly explained (leader peptide, translation, tryptophan codons, 3:4 loop, terminator, 2:3 loop).
|
| Feedback inhibition |
- 0 points: No mention of feedback inhibition or incorrect explanation of its effect on anthranilate synthase.
- 20 points: Feedback inhibition is mentioned, and its effect on anthranilate synthase is correctly explained (tryptophan binding to allosteric site, decrease in activity, shutting down the pathway).
|
| Other mistakes |
- 0 points: Other forms of regulation other than TrpR, attenuation, or feedback inhibition are mentioned.
- 20 points: No other forms of regulation mentioned.
|
