proteins - 2026 ACF Nationals

Packet 7: Tossup 11

A formula containing the constants 5500, 1490, and 125 is used to calculate the extinction coefficient of these molecules, which is usually between 4 and 24. Potassium sodium tartrate is used to chelate (“KEE-late”) metal ions in a test for these molecules that gives a peak at 540 nanometers. These molecules are oxidized by copper-two-plus, and the resulting (10[1])copper-plus is reacted with a mixture of phosphomolybdate and phosphotungstate called the Folin–Ciocalteu (-5[1])(“fo-LEEN cho-call-TEH-oo”) reagent, (10[1])in an assay for quantifying these molecules. (10[1])These molecules are quantified by their absorption at 280 nanometers (10[3])in spectrophotometry. (10[2]-5[2])Coomassie (10[1])blue is used (-5[1])in the Bradford assay (10[1])to quantify (10[1])these molecules. (10[1])These molecules (10[1])are linearized in beta-mercaptoethanol (10[1])and SDS before being loaded (10[1])into a polyacrylamide gel. For 10 points, name these macromolecules composed of amino acids. (10[4])■END■ (10[2])

ANSWER: proteins [or polypeptides; accept amino acids or aromatic amino acids until read; prompt on phenols by asking “what larger molecules are those phenolic groups typically part of in that assay?”]

<Editors, Chemistry> | G. Prelims 7 - Georgia Tech A + Berkeley A + Bruin + Georgetown

= Average correct buzzpoint

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Buzzes

Player	Team	Opponent	Buzzpoint	Value
Ilyas Choukri	Virginia Tech	Minnesota	56	10
Adam Fine	Chicago A	Texas	69	-5
Andrew Wang	Illinois A	Brown	70	10
Shiva Tegulla	UCF	British Columbia	77	10
Oscar Despard	Cambridge	Columbia A	87	10
Kunaal Chandrashekar	Toronto A	Penn State	87	10
Rohan Dalal	Georgia Tech B	UCLA	87	10
Rohit Chintala	Maryland A	Columbia B	89	-5
Coby Tran	Chicago B	Michigan	89	10
Alex Akridge	Indiana	NYU B	89	-5
Jason Zhang	Toronto B	Stanford A	89	10
Sharath Narayan	Northwestern A	Georgia Tech C	90	10
Tanay Bodducherla	UC Berkeley B	Vanderbilt	93	-5
Tiffany Zhou	Ohio State	Swarthmore	97	10
Ryan Rosenberg	NYU A	Northwestern B	99	10
June Yin	WashU	Harvard	101	10
Sinecio Morales	Johns Hopkins	Stanford B	103	10
Anurag Sodhi	MIT	Cornell	107	10
Eric Yang	Purdue	Maryland B	112	10
Zachary Joseph	Columbia B	Maryland A	126	10
Kelvin Ni	NYU B	Indiana	126	10
Dawson Teu	Waterloo	Pittsburgh	126	10
Joseph Chambers	Virginia	North Carolina	126	10
Athena Shadden	Texas	Chicago A	127	10
Gavin Markoff	Vanderbilt	UC Berkeley B	127	10

Summary

Tournament	Edition	Match	Heard	Conv. %	Neg %	Avg. Buzz
Main Site	2026-04-17	✓	21	100%	19%	100.43