<p>what about the pulmonary embolism question?</p>
<p>@ramboacid - No polar choice on Q1, I donât think. I remember spending quite some time reading through it to find a polar or charged choice, but in the end I put proline. Also, Iâm pretty sure collagen has both proline AND hydroxyproline. </p>
<p>@skater29 - The deadline to send in exams was yesterday. If anyone hasnât taken the semifinal yet, itâs too late (as far as I was aware). Also, I donât think anyone was DQed last year for answer discussion on CC prior to answer release (technically there wasnât an official answers release, I thought). HOWEVER, I shall cease discussion on any questions that havenât already been brought up just in case. </p>
<p>@ramboacid (again)</p>
<ul>
<li>The wood question was really weird. I put right, since xylem are usually wider than phloem and xylem were on the left. However, I was truly confused and out of time when I reviewed that question, so itâs quite probably that I missed it.</li>
<li>As far as the FRQ goes, Estrogen and Progesterone are only part of the problem. I felt that sheâd be deficient in ALL anterior pituitary hormones, and would have all associated symptoms (TSH, ACTH, etc.). I figured that the symptoms provided implied a deficiency in GH, FSH, and LH, and that she should be treated w/ TSH, ACTH, FSH, LH, GH, and Prolactin (not sure if I put prolactin, though). </li>
<li>Horseshoe crabs was cheliceroformes. Thereâs a picture in Campbell and Reece. </li>
<li>I thought the fertilization question was fine, but I may be mistaken.</li>
<li>For the population growth question, did you just multiply population size by r? (because dN/dt = rN?). Thatâs what I did, and I got D</li>
<li>Seconded on the arthropods. Since thereâs no negative deductions on part 3, I just put everything I could remember about arthropods on the table (in case something might turn out to be right). </li>
<li>Zone of maturation is right on root hairs. </li>
<li>I think youâre right on the nucleotide question. I donât remember the choices too well, though. </li>
</ul>
<p>I have other questions w/ answers now, but will refrain from further discussion until we have a guarantee that discussing answers is fine.</p>
<p>the website says that deadline to submit tests is march 23. i think we are definitely okay to discuss.</p>
<p>@param123 - Taking your word for it </p>
<p>CONTINUING,
- I wasnât sure about the biome questions. For estuary, they gave examples of SOME autotrophs and heterotrophs that might live there, but didnât really touch on the most important ones (mangroves, for example). As such, I wasnât sure whether or not that was valid. Like - Iâm sure estuaries have grass, algi, clams, worms, and crabs, but those arenât really representative species of an estuary. I really didnât like those questions.
- For the apical dominance question, I put that auxins were no longer being produced in the apical meristem and that auxin kept the lateral buds from developing. I didnât think that cytokinins were SYNTHESIZED in the lateral shoots. I was pretty sure that they came up from the roots
- I didnât realize the flower question had multiple answers, so I put Cactaceae
- For the floral pattern question (missing B, but has A and C), I put that it would be missing stamens and petals.
- I posted the answer to Klinefelterâs wrong. Itâs actually MEIOSES I AND II of OOGENESIS and MEIOSIS II of SPERMATOGENESIS. Or at least - thatâs what I got.
- MORE TO COME.</p>
<p>wait every question worth 2 points in part A had multiple anwswersâŠ? I only put Schwann cells for the multiple sclerosis question, I was considering oligodendrocytes as well darn itâŠ</p>
<p>For the myoglobin structure question, I put that the oxygen atoms tunnel through alpha helices to reach the heme in the core, but I canât confirm that on the web except that myoglobin is composed of 8 alpha helices.</p>
<p>@beandelphiki
I agree with the apical dominance question, cytokinins was almost correct except theyâre synthesized in the roots and not lateral buds.
I also got D for the population growth question, it was only dN/dt = rN.
I put Cactaceae as well, but how did you know that question is supposed to have multiple answers? There werenât directions indicating so, IIRC?</p>
<p>Cacti definitely evolved with insects, I put Rosacea but the right answer is Poacea since they are true grasses and donât even have flowers.</p>
<ul>
<li>There were definitely multiple answers given for the Schwann + Oligo question.
<ul>
<li>I donât remember what I put for myoglobin (maybe that?)</li>
<li>My bad - I think it only had one answer. Cactaceae was correct, as far as I"m aware</li>
</ul></li>
</ul>
<p>Were you a finalist last year ramboacid?</p>
<p>I know people who havent taken it because of exams in MA.</p>
<p>@beandelphiki
nah I wasnât a finalist last year, this is my first and last year doing USABO as Iâm sadly a senior. I got a 39 on the open exam this year so I was hoping to do well on semis, but I think I got duped by the test (why canât CEE just say when there are multiple answers >.< lol) I got high honors in chem olympiad last year, so Iâm gonna spend the next two weeks trying to make camp for that, though Iâd much rather qualify for USABO since organic chemistry isnât as fun as plants :D</p>
<p>@skater29
but the testing window is supposed to be over o.O
if people are still taking the test, how do we delete our posts?</p>
<p>If there was a delay it would be posted on the CEE web site like during the open exam. AFAIK there have been no weather emergencies in the northeast lately.</p>
<p>I beg to differ, organic chemistry is more enjoyable than basic chemistry.</p>
<p>For the Kleinfelterâs one, Iâm pretty sure (but not positive) it was Oogenesis Meiosis I and II and Spermatogenesis Meiosis I</p>
<p>Also, for the GPCR question, doesnât tryptophan (spelled that wrong) have slight polarity due to its nitrogen ring? Thatâs why I put tryptophan. Lol I guessed what ramboacid put for the myoglobin question.</p>
<p>@melkor I agree completely,
gen chem < organic chem < biochem and physiology ;)</p>
<p>@mg0305: youâre right re the meiosis klinefelter question.</p>
<p>@mg0305: Trp is effectively hydrophobic</p>
<p>[url=<a href=âhttp://www.russelllab.org/aas/Trp.html]Tryptophan[/urlâ>Tryptophan]Tryptophan[/url</a>]</p>
<p>âRole in structure: Being hydrophobic, Tryptophan prefers to be buried in protein hydrophobic cores. The aromatic side chain can also mean that Tryptophan is involved in stacking interactions with other aromatic side-chains.â</p>
<p>Also, Schwann cells are normally unaffected in MS (multiple sclerosis). In fact, because they arenât targeted, Schwann cells are actively being researched as possible replacements for remyelinating axons in MS patients.</p>
<p>Myoglobin one was the answer choice that talked about rapidly flexing structure to form pockets by which O2 can access</p>
<p>@Darksigma - was the answer to the myoglobin question in Campbell or something outside of Campbell? Also, I thought the MS question was more of a generic âwhat cells are important in myelin synthesisâ than a specific on MS. Iâm quite probably mistaken, however. Did you put proline for the amino acid question?</p>
<p>@BeanDelphiki: Outside of campbell, I only knew it because I had a conversation about myoglobin/hemoglobinâs structural dynamics with a professor once.</p>
<p>MS question was definitely a question about MS⊠otherwise they wouldnât have mentioned the disease. Questions with multiple choices were clearly distinguished by the wording of the question - this was not the case for the MS question to my knowledge. But my original post about Schwann cells still stands.</p>
<p>Yes I put proline.</p>
<p>Here are some more questions to discuss.</p>
<p>A certain genetic defect is caused by a sex-linked dominant allele with 70% penetrance. If a man w/ this genetic defect marries a normal woman, what percentage of their children would have this defect?</p>
<p>a) 25% b) 35% c) 50% d) 70% e) 90%</p>
<p>in a chromosome w/ the genes E, F, G, and H, the crossing over frequencies are as follows: E & F: 11% / E & G: 9% / E & H: 3% / F & H: 8%</p>
<p>What of the following are possible crossing over frequencies of genes G and H?
a) 6% b) 8% c) 12% d) 17% e) 19%</p>
<p>For the second electrophoresis question (Part B), which amino acid will move the quickest towards the positive pole in this trial?
a) aspartic acid b) glutamic acid c) lysine d) glycine e) leucine</p>
<p>True or False
The sensation of cold doesnât depend upon which section of the brain the cold receptors are wired to, but upon which receptors are stimulated.</p>
<p>Bone has interlocking stipules of calcium carbonate</p>
<p>The perception of sound is mediated by the movement of fluid in the semicircular canals against the cupulae</p>