chelation - 2025 ACF Winter

Question

A form of therapy for this process can be used to sequester and remove heavy ions from the body. For 10 points each:

[10m] Name this process in which a ligand “bites” onto more than one location on a metal atom. Agents for this process include EDTA.

ANSWER: chelation [or word forms like chelate; prompt on coordination or bonding]

[10e] Chelation therapy can be used when patients are exposed to this heavy metal that interacts with enzymatic sulfur groups. A tetraethyl derivative of this element was added to gasoline to prevent engine knocking.

ANSWER: lead [accept leaded gasoline; accept Pb]

[10h] Protein purification may exploit the chelation activity of this side chain with nickel affinity columns. Metalloproteins may use a brace named for an amino acid containing this organic molecule.

ANSWER: imidazole [prompt on histidine by asking “what moiety makes up the side chain?”]

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Summary


California	Main	Y	5	22.00	100%	100%	20%
Canada	Main	Y	1	20.00	100%	100%	0%
Florida	Main	Y	12	20.83	100%	83%	25%
Great Lakes	Main	Y	6	8.33	83%	0%	0%
Lower Mid-Atlantic	Main	Y	7	20.00	100%	86%	14%
Midwest	Main	Y	8	16.25	88%	75%	0%
North	Main	Y	11	18.18	100%	64%	18%
Northeast	Main	Y	5	14.00	100%	40%	0%
Overflow	Main	Y	4	15.00	100%	50%	0%
South Central	Main	Y	5	14.00	100%	40%	0%
Southeast	Main	Y	12	19.17	100%	75%	17%
UK	Main	Y	4	17.50	100%	75%	0%
Upper Mid-Atlantic	Main	Y	8	17.50	75%	75%	25%
Upstate NY	Main	Y	8	22.50	100%	88%	38%
2025 ACF Nationals	2025-08-09	Y	13	16.92	100%	62%	8%
2024 ARCADIA at UC Berkeley	04/19/2025	Y	4	12.50	75%	50%	0%

Data


Berkeley C	Stanford C	10	10	10	30
Berkeley E	Berkeley A	10	10	0	20
Berkeley B	Stanford B	10	10	0	20
Stanford A	UCSC	10	10	0	20
Claremont Scripps	UCSD Vices and Virtues	10	10	0	20
Queen's A	Toronto K	10	10	0	20
Toronto A	Waterloo	10	10	10	30
Guelph A	Toronto F	10	10	0	20
Toronto D	Toronto G	10	10	0	20
Toronto H	Toronto E	10	10	0	20
McMaster B	Toronto I	10	10	0	20
McGill A	Toronto J	10	10	0	20
Carleton	Toronto Metropolitan	10	10	0	20
Ottawa	Guelph B	10	10	10	30
McGill B	Queen's B	0	10	0	10
McGill C	McMaster C	0	10	0	10
Toronto B	McMaster A	10	10	10	30
Berkeley D	Berkeley F	10	10	0	20
USF	FSU	0	10	0	10
UF A	UF B	0	10	0	10
UF D	ERAU A	0	10	0	10
UF E	UCF A	0	10	0	10
Pitt B	CWRU A	0	10	0	10
CWRU B	Kenyon B	10	10	0	20
OSU C	CWRU C	10	10	10	30
MSU A	Pitt C	10	10	0	20
Pitt A	MSU B	10	10	0	20
OSU A	Kenyon A	10	10	0	20
OSU B	OSU D	10	10	0	20
North Carolina A	Clemson B	10	10	0	20
Liberty A	North Carolina C	10	10	0	20
Liberty B	NC State	0	10	0	10
North Carolina B	Virginia B	10	10	0	20
Clemson A	Roanoke	0	10	0	10
Tennessee B	James Madison	10	10	0	20
Tennessee A	Tusculum	10	0	0	10
Virginia A	South Carolina B	10	10	0	20
Melbourne B	Melbourne A	0	0	0	0
FIU	UCF B	0	10	0	10
Johns Hopkins C	Johns Hopkins B	10	10	0	20
George Mason A	George Washington A	0	10	0	10
Penn B	George Washington B	10	10	0	20
UMBC A	Georgetown B	0	10	0	10
Georgetown A	Johns Hopkins A	0	10	0	10
Maryland B	George Mason C	10	10	0	20
Maryland C	George Mason B	10	10	0	20
NYU B	Catholic University	10	10	0	20
Maryland D	Notre Dame E	0	10	0	10
Penn A	VCU A	10	10	10	30
Vassar A	Columbia B	0	10	0	10
Rutgers B	Lehigh B	0	10	0	10
Rowan A	Columbia C	10	10	0	20
Rutgers C	Lehigh A	0	10	0	10
Swarthmore A	Princeton A	10	10	0	20
Missouri A	WashU D	10	10	0	20
WashU A	Truman State	10	10	0	20
WashU B	Missouri B	0	10	0	10
WashU C	William Woods	0	10	0	10
Macalester B	Minnesota C	0	10	0	10
Iowa State	Minnesota A	10	10	0	20
Carleton	Minnesota B	0	10	0	10
Nebraska	Macalester A	10	10	0	20
Wisconsin	St. Thomas	0	10	0	10
Brandeis Orlando	Amherst B	0	10	0	10
BC A	Bowdoin B	10	10	0	20
Tufts B	BC B	0	10	0	10
BU	Yale A	10	10	0	20
Cornell-UG	Brandeis Clemenceau	10	10	0	20
Brandeis Wilson	Bowdoin A	10	10	0	20
Dartmouth	Brown C	10	10	0	20
Harvard	Amherst A	10	10	10	30
MIT A	Brown A	0	10	0	10
Brown B	Tufts A	10	10	0	20
MIT B	Williams	10	10	0	20
Yale B	Brandeis Lloyd George	10	10	10	30
British Columbia A	Alberta	10	10	0	20
British Columbia C	British Columbia B	0	10	0	10
Washington B	British Columbia D	10	10	0	20
Simon Fraser	Washington A	10	10	0	20
Maryland A	NYU A	10	10	10	30
Alberta B	Northwestern C	10	10	0	20
Arizona State A	Tulsa	10	10	10	30
Iowa	Arizona State B	10	10	0	20
Northwestern A	Rose State	10	10	10	30
UTD B	Texas A	0	0	0	0
Texas B	UTD A	0	0	0	0
McGill D	UCO	10	10	0	20
Auburn A	Alabama B	10	10	10	30
Alabama A	Auburn B	10	10	0	20
Georgia Tech C	Sewanee A	10	10	0	20
Georgia Tech D	Bruin A	10	10	0	20
Huntsville A	Mississippi State A	10	10	0	20
Georgia Tech A	Huntsville B	10	10	10	30
UAB A	Vanderbilt B	10	10	10	30
Vanderbilt A	Georgia Tech B	0	10	0	10
Birmingham A	LSE A	10	10	0	20
Cambridge D	Bristol B	10	10	0	20
Cambridge A	Bristol A	10	10	0	20
Oxford A	Cambridge C	10	10	0	20
Durham B	LSE B	0	10	0	10
Edinburgh A	Southampton A	10	10	0	20
Sheffield A	Imperial A	0	10	0	10
Imperial C	City St George's A	10	10	10	30
Manchester A	Warwick A	0	10	0	10
Edinburgh B	Oxford B	0	10	0	10
Durham A	Sheffield B	10	10	0	20
Lancaster A	Southampton B	0	10	0	10
Cambridge B	Warwick B	10	10	0	20
Cornell-DII	Binghamton A	10	10	0	20
ESF	Binghamton B	0	10	0	10
RIT B	RIT A	10	10	0	20
Syracuse	Rochester	0	0	0	0
Northwestern B	Ohio	10	10	0	20