<p>I’m very well aware of the scope of USABO. Promise.
Just trying to offer some advice. No hostility intended. Chill. </p>
<p>In other news, after much trouble, grading of the open begins. Hope that all was a one time problem.</p>
<p>@cadaeibfed were you a previous finalist? you posted a couple times on 2006/2007 usabo threads…how are you still doing usabo?</p>
<p>I’m pretty sure the zebrafish larvae feed on paramecium typically after 5 days from fertilization. The following zebrafish article says exogenous feeding typically begins post 5 days of fertilization. This seems like a pretty legit site and like it is completely dedicated to zebrafish so it should be accurate.</p>
<p>[Welcome</a> To ZHA](<a href=“http://www.zhaonline.org/education.html]Welcome”>http://www.zhaonline.org/education.html) </p>
<p>I don’t know though other sources say the yolk can suffice for up to 10 days :/</p>
<p>I found this link =P</p>
<p>“Zebrafish larvae during the first week resemble early mouse embryos in that they are
chiefly sustained by nutrients derived from the yolk.”</p>
<p><a href=“Animal Research Advisory Committee (ARAC) Guidelines | OACU”>Animal Research Advisory Committee (ARAC) Guidelines | OACU;
<p>thats a nih.gov so its also really reliable. It dosen’t mention anything about paramecium </p>
<p>So 1 week = 7 days. Close enough to 10 days haha?</p>
<p>If I make the semis, I will be so overly happy when I completely fail them</p>
<p>@JeffreyTao</p>
<p>As best as I can remember it, the question involved a person infected with virus “Ijustmadethisup.” The doctors thought it had something to do with an overactive hormone. Symptoms included back pain and weak bones. Parathyroid hormone regulates blood calcium level, playing glucagon to calcitonin’s insulin. So basically, this person’s bones have been breaking down, like they would in classic hyperparathyroidism. Honestly, I don’t remember any of the other answer choices. Does anyone else?</p>
<p>Yeah, I was wondering when someone would mention that iBelieveSo.
I thought it ought to have been quickly obvious that I’m not a student.
Here’s a slightly depressing thought - I competed in USABO back when you guys were still in elementary school.
I’m participating in other ways these days. </p>
<p>Fish, at that point it’s still yolk. Like, maybe they can begin eating, but that’d still be secondary.</p>
<p>@iceonfire</p>
<p>Thanks for answers my question! Unfortunately, my memory of the exam is basically gone now. D;</p>
<p>not sure what this means for sure, but the nih link says:</p>
<p>“Only after 7 dpf do zebrafish larvae manifest signs of ill health in the absence of external feeding (20). Active feeding can not commence at hatching because brain structures required for detecting and catching prey have not developed. At hatching, larvae lack taste buds (21, 22), have poor visual acuity (14), and cannot swim effectively as they lack a swim bladder and have deficient motor control (23, 24). Therefore in zebrafish the period between hatching and nutritional independence at 8 dpf is essentially an extension of the early embryonic stage during which the fish continues to develop sensory and motor functions required for the independent larval stage.
Thus during the first week of development, zebrafish remain in an immature state consuming yolk for nourishment and responding to stimulation with simple reflexive movements. As larvae become nutritionally independent during the second week of life, they also acquire more sophisticated cognitive abilities.”</p>
<p>When do results come back? I thought they were supposed to come back today on March 5th?</p>
<p>This is what we knew (through emblem101) as of a few days ago:
</p>
<p>[CEE</a> | USABO 2012 Calendar](<a href=“http://www.usabo-trc.org/currentcalendar.php]CEE”>http://www.usabo-trc.org/currentcalendar.php)
The calendar was updated that very day, in fact.
Don’t see why anyone would be complaining about an extra week plus of study time, though.
Hoping everybody enjoys the semi!</p>
<p>Well I just checked and scores are not up yet. I don’t remember what time they were up last year, but I definitely think it was after the start of the business day. </p>
<p>Tomorrow is looking to be a big day (score, admssions decision, scholarship interview, etc). </p>
<p>Good luck to all.</p>
<p>This is on my teacher’s USABO page.</p>
<p>The score report for each student in your school who took the 2012 USA Biology Olympiad (USABO) Open Exam is found below. The Open Exam was worth 50 points, one point per question. The average score on the exam was 16.027. The highest score was 42. Students who scored 24 or higher were invited to compete in the USA Biology Olympiad Semifinal Exam.</p>
<p>I just emailed my teacher and he can’t see anything as of now</p>
<p>ggrrrr…so nervous. Im usually pretty good at bio but usabo open was really hard this time around. D:</p>
<p>if the cutoff is 24… i’m doomed</p>
<p>Result should be out today, but I can’t find it.</p>
<p>^ the more I think about it… the student scores did not come out on the website for quite a while after the “announcement” date. Ask your teacher for your score.</p>
<p>The cutoff is indeed 24.</p>