Packet 1: Bonus 20
This molecule was discovered at the active site of a methyltransferase enzyme from Methanosarcina barkeri. For 10 points each:
[10h] Name this nonstandard amino acid discovered in methanogens (“meth-ANN-oh-jens”), where it is coded for by the codon UAG. The PYLIS element forms a hairpin that assists with the incorporation of this amino acid.
ANSWER: pyrrolysine (“pir-oh-LY-seen”)
[10e] Pyrrolysine is encoded by UAG, which, along with UAA and UGA, more often appear as one of these sequences signaling the end of translation.
ANSWER: stop codons
[10m] Another nonstandard amino acid is a version of cysteine in which this atom replaces sulfur. That nonstandard amino acid containing this atom is incorporated via the SECIS (“SEE-siss”) element.
ANSWER: selenium [or Se]
<Waterloo, Biology> | A. Prelims 1 - Waterloo + Toronto A + Georgia Tech B
| Heard | PPB | E % | M % | H % |
|---|---|---|---|---|
| 4 | 22.50 | 100% | 100% | 25% |
Conversion
| Team | Opponent | Part 1 | Part 2 | Part 3 | Total | Parts |
|---|---|---|---|---|---|---|
| Bruin | Toronto B | 0 | 10 | 10 | 20 | EM |
| Columbia B | MIT | 0 | 10 | 10 | 20 | EM |
| Indiana | Maryland A | 10 | 10 | 10 | 30 | HEM |
| UC Berkeley A | Columbia A | 0 | 10 | 10 | 20 | EM |
Summary
| Tournament | Edition | Match | Heard | PPB | E % | M % | H % |
|---|---|---|---|---|---|---|---|
| Main Site | 2026-04-17 | ✓ | 4 | 22.50 | 100% | 100% | 25% |