Packet 7: Bonus 9
Childhood infection by a species of this genus has been linked to Tourette’s syndrome and OCD by the PANDAS (“pandas”) hypothesis. For 10 points each:
[10m] The Lancefield grouping is mainly used to classify species of what genus? A “group A” species of this genus is the causative agent of scarlet fever.
ANSWER: Streptococcus [accept Streptococcus pyogenes or group A streptococcus; prompt on Strep pyogenes or strep throat; prompt on GAS]
[10e] S. pyogenes (“pye-AW-jeh-neez”) is the source of this RNA-guided endo·nuclease, which targets CRISPR sequences in a popular gene-editing technique.
ANSWER: Cas9 [accept CRISPR-Cas9; accept CRISPR associated protein 9; prompt on Cas]
[10h] Rebecca Lancefield discovered this virulence factor in S. pyogenes, which inhibits C3 convertase by binding to factor H. Rheumatic fever is caused by the cross-reactivity between myosin and antibodies against this protein.
ANSWER: M protein [reject “protein M”]
<TC, Biology> | NAFTA-Packet-7
| Heard | PPB | E % | M % | H % |
|---|---|---|---|---|
| 43 | 13.26 | 84% | 37% | 12% |
Conversion
Summary
| Tournament | Edition | Match | Heard | PPB | E % | M % | H % |
|---|---|---|---|---|---|---|---|
| 2026 NAFTA at Stanford | 01/17/2026 | ✓ | 4 | 12.50 | 100% | 25% | 0% |
| 2026 NAFTA at UBC | 01/17/2026 | ✓ | 2 | 10.00 | 100% | 0% | 0% |
| 2025 NAFTA Online | 02/14/2026 | ✓ | 4 | 20.00 | 100% | 75% | 25% |
| 2026 NAFTA at Vanderbilt | 02/14/2026 | ✓ | 3 | 16.67 | 67% | 67% | 33% |
| 2025 NAFTA at Toronto | 09/13/2025 | ✓ | 5 | 14.00 | 80% | 40% | 20% |
| 2025 NAFTA at Maryland | 09/27/2025 | ✓ | 5 | 8.00 | 60% | 20% | 0% |
| 2025 NAFTA at Harvard | 10/04/2025 | ✓ | 3 | 10.00 | 67% | 33% | 0% |
| 2025 NAFTA at Oxford | 10/11/2025 | ✓ | 4 | 7.50 | 75% | 0% | 0% |
| 2025 NAFTA at Chicago | 11/08/2025 | ✓ | 6 | 18.33 | 100% | 50% | 33% |
| 2025 NAFTA at Columbia | 11/08/2025 | ✓ | 5 | 10.00 | 80% | 20% | 0% |
| 2025 NAFTA at Richmond | 12/20/2025 | ✓ | 2 | 20.00 | 100% | 100% | 0% |