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Packet 2: Bonus 10

In this organelle, reactive oxygen species are often formed when electrons move from ferredoxin (“fair-uh-DOX-in”) to O2. For 10 points each:
[10e] Name this organelle, within which electrons from photosystem I (“one”) can move to oxygen to form radicals as part of the water–water cycle. This organelle contains stacks of thylakoids.
ANSWER: chloroplasts
[10m] Chloroplasts contain several isoforms of this enzyme with iron, copper, zinc, or manganese in its active site. This enzyme, which is mutated in some familial types of ALS, catalyzes a disproportionation producing O2 and H2O2.
ANSWER: superoxide dismutase [or SOD]
[10h] This protein carries electrons from cytochrome b6f to the P700 center of photosystem I. This protein’s copper center is forced into an entatic state to speed up electron transfer.
ANSWER: plastocyanin [prompt on PC; reject “plastoquinone”]
<Brown, Biology> | B. Prelims 2 - Northwestern A + Virginia Tech + Brown + Penn State

HeardPPBE %M %H %
2114.76100%48%0%

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Conversion

TeamOpponentPart 1Part 2Part 3TotalParts
BruinStanford A1010020EM
Chicago AOhio State100010E
Columbia AUCF1010020EM
Columbia BCornell100010E
HarvardGeorgetown1010020EM
Illinois BToronto B1010020EM
IndianaMIT1010020EM
Johns HopkinsNorthwestern B1010020EM
MichiganGeorgia Tech C100010E
MinnesotaGeorgia Tech B100010E
NYU AStanford B100010E
NYU BWaterloo1010020EM
North CarolinaBritish Columbia100010E
PittsburghMaryland A100010E
SwarthmoreTexas100010E
Toronto AMaryland B1010020EM
UC Berkeley ARutgers1010020EM
UCLAPurdue100010E
VanderbiltIllinois A100010E
VirginiaCambridge100010E
WashUGeorgia Tech A1010020EM

Summary

TournamentEditionMatchHeardPPBE %M %H %
Main Site2026-04-17✓2114.76100%48%0%