Packet 4: Bonus 3
Chromatium and De·sulfo·vibrio bacteria perform this interaction by utilizing each other’s sulfur waste products as energy sources. For 10 points each:
[10h] Name this form of facultative mutualism in which the beneficial relationship is not obligatory for either partner.
ANSWER: protocooperation [prompt on cooperation or word forms; reject “commensalism”]
[10m] In an example of protocooperation, E. coli and Entero·coccus work together to metabolize this amino acid into putrescine (“pew-TRUH-seen”). A manganese-containing enzyme converts this amino acid to ornithine in the last step of the urea cycle.
ANSWER: L-arginine [or Arg; accept R; accept arginase]
[10e] Attini ants protocooperate with these organisms by colonizing the latter into “gardens.” Mycorrhizae (“mai-KOH-rye-zay”) form from the mutualism between members of this kingdom and plant roots.
ANSWER: funguses [or Fungi]
<KN, Biology> | NAFTA-Packet-4
| Heard | PPB | E % | M % | H % |
|---|---|---|---|---|
| 38 | 13.68 | 100% | 37% | 0% |
Conversion
| Team | Opponent | Part 1 | Part 2 | Part 3 | Total | Parts |
|---|---|---|---|---|---|---|
| Berkeley A | Team 7 | 0 | 10 | 10 | 20 | ME |
| Constans Constantius and Constantine Jr. | Stanford A | 0 | 10 | 10 | 20 | ME |
| Not Old! (Old) | Stanford B | 0 | 10 | 10 | 20 | ME |
| Team 8 | Berkeley B | 0 | 0 | 10 | 10 | E |
Summary
| Tournament | Edition | Match | Heard | PPB | E % | M % | H % |
|---|---|---|---|---|---|---|---|
| 2026 NAFTA at Stanford | 01/17/2026 | ✓ | 4 | 17.50 | 100% | 75% | 0% |
| 2026 NAFTA at UBC | 01/17/2026 | ✓ | 2 | 10.00 | 100% | 0% | 0% |
| 2026 NAFTA at Vanderbilt | 02/14/2026 | ✓ | 3 | 16.67 | 100% | 67% | 0% |
| 2025 NAFTA at Toronto | 09/13/2025 | ✓ | 4 | 12.50 | 100% | 25% | 0% |
| 2025 NAFTA at Maryland | 09/27/2025 | ✓ | 5 | 12.00 | 100% | 20% | 0% |
| 2025 NAFTA at Harvard | 10/04/2025 | ✓ | 3 | 16.67 | 100% | 67% | 0% |
| 2025 NAFTA at Oxford | 10/11/2025 | ✓ | 4 | 15.00 | 100% | 50% | 0% |
| 2025 NAFTA at Chicago | 11/08/2025 | ✓ | 6 | 13.33 | 100% | 33% | 0% |
| 2025 NAFTA at Columbia | 11/08/2025 | ✓ | 5 | 12.00 | 100% | 20% | 0% |
| 2025 NAFTA at Richmond | 12/20/2025 | ✓ | 2 | 10.00 | 100% | 0% | 0% |