Question

The selective expression of proteins like MSI60 and MSI31 in different layers of these objects likely help control substrate polymorphs. These objects’ resilience is partially due to a large, spring-like protein called lustrin A. These objects’ matrices consist of beta-chitin (“KY-tin”) sandwiched between beta-sheets of glycine and alanine-rich fibroin (-5[1])(“FY-broh-in”)-like proteins, all coated in a layer of aspartic (-5[1])acid-rich proteins. These objects incorporate a material in which hexagonal, (10[1])close-packed platelets form a regular “brick wall” structure. That biocomposite aragonite found in these objects (10[1])is responsible (-5[1])for their iridescent structural (10[1]-5[1])coloration. These objects consist (-5[1])of a periostracum, a prismatic layer, and a lustrous nacreous layer. (10[2]-5[3])They’re (-5[1])not (-5[1])trees, (-5[1])but these objects grow at (-5[1])their distal edges, leading to (-5[1])growth lines and characteristic (10[1])spiral shapes. For 10 points, (10[2])name these calcified (10[1])protective structures (10[1])formed by (10[1])mollusks like conchs. (10[2]) (10[11])■END■

ANSWER: mollusk shells [accept seashells; accept valves; prompt on nacre until “nacreous” is read; prompt on mother-of-pearl; prompt on pearls; prompt on bivalves; prompt on exoskeletons]
<Biology>
= Average correct buzz position

Summary

2023 ACF Nationals04/22/2023Y24100%0%54%121.71

Buzzes

PlayerTeamOpponentBuzz PositionValue
Jason HongBrown AWUSTL A47-5
Geoffrey ChenCornell AStanford A55-5
Andrew HannaVanderbilt AUC Berkeley B6510
Shahar SchwartzUC Berkeley ANorthwestern A8010
Noah ChenColumbia BRutgers B82-5
Tracy MirkinFlorida AYale A8610
David BassVirginia APenn State A86-5
Joelle SmartRutgers AWUSTL B90-5
Mazin OmerHarvard AColumbia A101-5
Dan NiCornell BToronto A10110
Tomás Aguilar-FragaClaremont AIowa State A10110
Jim FanNorth Carolina AChicago C101-5
S. A. ShenoyGeorgia Tech BYale B101-5
Jeya IyaduraiFlorida BJohns Hopkins A102-5
Karan GurazadaTexas AIndiana A103-5
Clark SmithOhio State AChicago A104-5
Todd MaslykMichigan AHouston A109-5
Ashish SubramanianDuke AChicago B114-5
Halle FriedmanNYU AImperial A11810
Benjamin McAvoy-BickfordPenn AIllinois A12310
Julian GatchSouth Carolina AMcGill A12310
Grace LiuMIT AMinnesota A12610
Arya KarthikGeorgia Tech AMaryland A12810
Ben DahlPurdue AMinnesota B13010
Alex SchmidtPenn State AVirginia A13310
June YinWUSTL BRutgers A13310
Lexi TermanRutgers BColumbia B13410
Alan XieYale BGeorgia Tech B13410
Charles HangWUSTL ABrown A13410
John John GrogerColumbia AHarvard A13410
Dennis ReppenChicago CNorth Carolina A13410
Alex AkridgeIndiana ATexas A13410
Natan HoltzmanStanford ACornell A13410
Jonathan LauJohns Hopkins AFlorida B13410
John BroussardHouston AMichigan A13410
Adam FineChicago AOhio State A13410
John MarvinChicago BDuke A13410