Question
Answer the following about Aliivibrio fischeri activity within the Hawaiian bobtail squid, for 10 points each.
[10e] In exchange for being allowed to grow, A. fischeri enables the squid to hide its shadow via bioluminescence, exemplifying this form of symbiosis. Both organisms benefit in this symbiotic relationship.
ANSWER: mutualism [or word forms like mutualistic]
[10m] A. fischeri activates bioluminescence by regulating the lux operon via this process. More generally, this process involves bacteria changing their protein expression based on the cell density of their environment.
ANSWER: quorum sensing [accept QS]
[10h] Bacteria release and then track the concentration of these chemicals to determine whether cell density is high enough for quorum sensing. Acyl homoserine-lactones are the version of these chemicals used by A. fischeri.
ANSWER: autoinducers [accept quorum factors]
<Biology>
Summary
| 2024 ACF Regionals @ Berkeley | 01/27/2024 | Y | 3 | 20.00 | 100% | 100% | 0% |
| 2024 ACF Regionals @ Cornell | 01/27/2024 | Y | 3 | 13.33 | 100% | 33% | 0% |
| 2024 ACF Regionals @ JMU | 01/27/2024 | Y | 11 | 14.55 | 100% | 46% | 0% |
| 2024 ACF Regionals @ Minnesota | 01/27/2024 | Y | 2 | 15.00 | 100% | 50% | 0% |
| 2024 ACF Regionals @ Nebraska | 01/27/2024 | Y | 6 | 15.00 | 100% | 50% | 0% |
| 2024 ACF Regionals @ Ohio State | 01/27/2024 | Y | 3 | 13.33 | 100% | 33% | 0% |
| 2024 ACF Regionals @ Rutgers | 01/27/2024 | Y | 5 | 12.00 | 100% | 20% | 0% |
| 2024 ACF Regionals @ Imperial | 01/27/2024 | Y | 4 | 17.50 | 100% | 75% | 0% |
| 2024 ACF Regionals @ Vanderbilt | 01/27/2024 | Y | 5 | 12.00 | 100% | 20% | 0% |
Data
| Sheffield | Bristol | 10 | 0 | 0 | 10 |
| Cambridge A | Warwick | 10 | 10 | 0 | 20 |
| Imperial A | Durham A | 10 | 10 | 0 | 20 |
| Durham B | Oxford C | 10 | 10 | 0 | 20 |