Bonus
Oxygen competitively inhibits this enzyme’s active site, leading to a side reaction that produces the toxic compound 2-phosphoglycolate. For 10 points each:
[10m] Name this most abundant enzyme on Earth. This enzyme fixes carbon dioxide to a ribulose derivative during the Calvin cycle.
ANSWER: RuBisCO (“roo-BISS-ko”) [or ribulose-1,5-bisphosphate carboxylase-oxygenase or RuBPCase or RuBPco]
[10h] To mitigate oxygen inhibition, some plants use this pathway in which the Calvin cycle is sequestered in bundle-sheath cells. In this pathway, carbon dioxide is fixed to produce malate or aspartate in mesophyll cells.
ANSWER: C4 photosynthesis [or C4 carbon fixation or Hatch-Slack pathway; reject “C3 photosynthesis”]
[10e] RuBisCO is tethered by carboxysomes in photosynthetic organisms from this taxonomical domain that may have caused the Great Oxygenation Event. The three-domain system includes Archaea, Eukarya, and this domain.
ANSWER: Bacteria [accept cyanobacteria; reject “algae”]
<Georgia Tech A, Biology>
| Editions | Heard | PPB | Easy % | Medium % | Hard % |
|---|---|---|---|---|---|
| 2 | 106 | 10.94 | 43% | 47% | 20% |
Conversion
| Team | Opponent | Part 1 | Part 2 | Part 3 | Total | Parts |
|---|---|---|---|---|---|---|
| UC Santa Barbara | USC A | 0 | 0 | 10 | 10 | E |
| UCLA A | UC Irvine | 10 | 0 | 10 | 20 | ME |
| UCLA C | Claremont A | 10 | 0 | 0 | 10 | M |
| UCLA D | Claremont C | 0 | 0 | 0 | 0 | |
| UCLA F | Claremont B | 0 | 0 | 0 | 0 | |
| UCSD A | UCLA B | 10 | 10 | 10 | 30 | MHE |
| USC B | UCSD B | 0 | 0 | 10 | 10 | E |
Summary
| Tournament | Edition | Exact Match? | Heard | PPB | Easy % | Medium % | Hard % |
|---|---|---|---|---|---|---|---|
| Northern California | US | Y | 4 | 15.00 | 50% | 50% | 50% |
| Southern California | US | Y | 7 | 11.43 | 57% | 43% | 14% |
| Eastern Canada (1) | US | Y | 4 | 10.00 | 25% | 50% | 25% |
| Eastern Canada (2) | US | Y | 9 | 12.22 | 56% | 67% | 0% |
| Florida | US | Y | 4 | 2.50 | 25% | 0% | 0% |
| Great Lakes | US | Y | 10 | 15.00 | 50% | 60% | 40% |
| Lower Mid-Atlantic | US | Y | 9 | 14.44 | 56% | 56% | 33% |
| Upper Mid-Atlantic | US | Y | 9 | 10.00 | 44% | 56% | 0% |
| Midwest | US | Y | 9 | 14.44 | 33% | 67% | 44% |
| North | US | Y | 4 | 10.00 | 25% | 50% | 25% |
| Northeast | US | Y | 12 | 6.67 | 25% | 33% | 8% |
| Pacific | US | Y | 8 | 8.75 | 38% | 38% | 13% |
| Southeast | US | Y | 12 | 9.17 | 42% | 33% | 17% |
| Upstate NY | US | Y | 5 | 12.00 | 60% | 40% | 20% |