"Official" 2014 USABO thread

Test Preparation AP Sciences
881

<p>alright i got 33.75. if anyone’s interested.</p>

882

<p>Anyone remember the progeria one</p>

883

<p>well technically it was a 56.75 but i like to round in my favor ;)</p>

884

<p>Then I got a 0 because I don’t like to round in my favor :)</p>

885

<p>what was the question again?</p>

886

<p>I recently watched a TED talk on progeria. Great talk.</p>

887

<p><a href=“My philosophy for a happy life | Sam Berns | TEDxMidAtlantic - YouTube”>My philosophy for a happy life | Sam Berns | TEDxMidAtlantic - YouTube; </p>

888

<p>breakdown of 134 is something like 40 / 60 part A, 80 / 120 part B, 15 / 65 part C. Isn’t that kinda lowish for top 20? sorry if i sound harsh.</p>

889

<p>a 160 would be 45, 95, 20…</p>

890

<p>I think a 150 something would be reasonable for the cutoff like a 45, 85, 20something. That’s like getting 70%+ on the first two parts and doing kinda bad on the last one. Or maybe this is just me refusing to see how badly I failed</p>

891

<p>150 doesn’t sound too unreasonable. keep in mind the 2012 cutoff was like 134/237</p>

892

<p>I don’t think people will score higher on part B than on part A. I thought part A was easy.</p>

893

<p>Any other hard questions?</p>

<p>For the Poly-A DNA in the northern blotting question in Part C, I put that it’s supposed to blank the background to prevent the probe from randomly binding and getting stuck in the nitrocellulose, kind of like the function of milk protein in Western Blotting.</p>

894

<p>that’s what I put also, but I think it’s actually just to bind to the mRNA</p>

895

<p>^i said bind to the mRNA to isolate/stabilize it </p>

896

<p>But honestly, I think our answer has some merit, too, so hopefully partial credit :3</p>

897

<p>when it says top 20 is posted on usabo website on april 16, does it means at 12 am on april 16, or could it be any random hour on april 16?</p>

898

<p>If you make it, you’ll get an email from USABO before the public posting date. </p>

899

<p>Bean you said you were notified the second saturday of april?</p>

900

<p>@spazzer4501‌ @botherme‌
I don’t think it’s to bind to the mRNA. If that were the case, it would be Poly-T DNA, not Poly-A DNA</p>