Bonus
Two answers required. A baby’s lungs are considered mature if the ratio between these two molecules is more than 2-to-1. For 10 points each:
[10h] Name these two compounds. One of these compounds is found in the lipid that surrounds nerve cell axons, and the other is a type of amphiphilic yellow-brown fatty substance found in animal tissue.
ANSWER: sphingomyelin AND lecithin (“LESS-uh-thin”) [accept lecithin–sphingomyelin ratio; prompt on L/S ratio; prompt on partial answers; reject “myelin”]
[10e] The lecithin-sphingomyelin ratio is tested using this substance. This liquid fills the “sac” around a fetus.
ANSWER: amniotic fluid [accept amniotic sac]
[10m] The centesis of amniotic fluid to test genetic material is usually safer than a “chorionic sampling” procedure named for these structures. These structures can atrophy from inflammation due to conditions like celiac disease.
ANSWER: villi [accept microvilli; accept chorionic villus sampling]
<Chicago B, Biology>
| Editions | Heard | PPB | Easy % | Medium % | Hard % |
|---|---|---|---|---|---|
| 1 | 52 | 14.23 | 96% | 42% | 4% |
Conversion
| Team | Opponent | Part 1 | Part 2 | Part 3 | Total | Parts |
|---|---|---|---|---|---|---|
| Cambridge A | Cambridge E | 0 | 10 | 10 | 20 | EM |
| Cambridge B | Warwick B | 0 | 10 | 10 | 20 | EM |
| Cambridge C | Warwick A | 0 | 10 | 10 | 20 | EM |
| Cambridge D | Bristol | 0 | 10 | 0 | 10 | E |
| Imperial B | Sheffield | 0 | 10 | 0 | 10 | E |
| LSE | Oxford C | 0 | 10 | 10 | 20 | EM |
| Manchester | Southampton B | 0 | 10 | 10 | 20 | EM |
| NYU C | Imperial A | 0 | 10 | 0 | 10 | E |
| Oxford B | Durham | 0 | 10 | 10 | 20 | EM |
| Southampton A | Oxford A | 0 | 10 | 10 | 20 | EM |
Summary
| Tournament | Edition | Heard | PPB | Easy % | Medium % | Hard % |
|---|---|---|---|---|---|---|
| California | 2025-02-01 | 3 | 13.33 | 100% | 33% | 0% |
| Florida | 2025-02-01 | 1 | 20.00 | 100% | 100% | 0% |
| Lower Mid-Atlantic | 2025-02-01 | 3 | 13.33 | 100% | 33% | 0% |
| Midwest | 2025-02-01 | 6 | 16.67 | 100% | 50% | 17% |
| North | 2025-02-01 | 3 | 13.33 | 100% | 33% | 0% |
| Northeast | 2025-02-01 | 5 | 10.00 | 80% | 20% | 0% |
| Overflow | 2025-02-01 | 5 | 8.00 | 80% | 0% | 0% |
| South Central | 2025-02-01 | 2 | 15.00 | 100% | 50% | 0% |
| Southeast | 2025-02-01 | 4 | 12.50 | 100% | 25% | 0% |
| UK | 2025-02-01 | 10 | 17.00 | 100% | 70% | 0% |
| Upper Mid-Atlantic | 2025-02-01 | 8 | 15.00 | 100% | 50% | 0% |
| Upstate NY | 2025-02-01 | 2 | 20.00 | 100% | 50% | 50% |