Question

In one family of animals, this process depends on changes in the spacing of a lattice of guanine nanocrystals. Undulating displays of this process have been termed “passing (-5[1])clouds” (10[1])and (10[1])result from sequential activation of neural pathways in the satellite ganglia and anterior pedal lobes. Organs composed of glia, sheath cells, and radial fibers expand or shrink the cytoelastic sacculus to generate this process in coleoid members of a class of animals. Off-axis, U-shaped pupils may facilitate this process by maximizing a kind of “blur”; that (10[1])hypothesis has supplanted the idea that (-5[1])this process is facilitated by undiscovered dermal opsins. (10[2]-5[1])Non-cephalopods (10[2])that can perform (10[2])this (10[1])process (10[1])cause it by changing the distribution of molecules (10[2])like heme and melanin (10[2]-5[2])in (10[1])cells (-5[1])called (10[1])chromatophores. (10[1])For 10 points, octopi and chameleons use pigments to rapidly undergo what camouflage mechanism? (10[1])■END■ (10[5])

ANSWER: skin color change [or metachrosis; prompt on crypsis; prompt on background, active, or adaptive camouflage until read by asking “what is the mechanism of camouflage?”; prompt on changing appearance or equivalents by asking “what aspect of the animal’s appearance changes?”; prompt on body patterning by asking “what aspect of body patterning?”] (The first sentence refers to chameleon skin, which has a layer of guanine nanocrystals overlaying chromatophores.)
<Biology>
= Average correct buzz position

Summary

2023 ACF Nationals04/22/2023Y24100%0%25%107.88

Buzzes

PlayerTeamOpponentBuzz PositionValue
Natan HoltzmanStanford AFlorida A27-5
Dan NiCornell BNorth Carolina A2810
Conor ThompsonIowa State AIllinois A2910
Collin AceRutgers BVanderbilt A8510
Mazin OmerHarvard ATexas A91-5
S. A. ShenoyGeorgia Tech BVirginia A99-5
Geoffrey ChenCornell AGeorgia Tech A9910
Dennis ReppenChicago CMinnesota A9910
Todd MaslykMichigan AImperial A10010
Noah ChenColumbia BNYU A10010
Alex SchmidtPenn State APenn A10310
Ben DahlPurdue AUC Berkeley B10310
Tanis NielsenClaremont ASouth Carolina A10410
Jacob Van OorschotMcGill ARutgers A10510
John MarvinChicago BBrown A11310
Matthew LehmannWUSTL AOhio State A11310
Shahar SchwartzUC Berkeley AMIT A117-5
Christopher SimsNorthwestern AIndiana A11710
Simon GorbatyDuke AMaryland A117-5
John BroussardHouston AFlorida B11710
John John GrogerColumbia AToronto A11810
Karsten RynearsonYale BWUSTL B119-5
Adam FineChicago AYale A12010
Jonathan LauJohns Hopkins AMinnesota B12110
Tracy MirkinFlorida AStanford A13510
David BassVirginia AGeorgia Tech B13610
Brad MacLaineTexas AHarvard A13610
Nathan SheffieldMIT AUC Berkeley A13610
Vedul PalavajjhalaWUSTL BYale B13610
Connor MayersMaryland ADuke A13610