<p>there was this one question which kept on bugging me, it was something like “all marine and terrestial ecosystems depend on this organism”, and two of the answers were fungi and nitrogen-fixing bacteria. can anyone help me out on this one?</p>
<p>I think it’s nitrogen-fixing bacteria, but I can’t remember the question exactly. I don’t think fungi is the answer, because I can’t think of any aquatic fungi that are critical. I think the chytrids are aquatic, but the book never emphasized any sort of critical function of them.</p>
<p>What about the 4-term Hardy-Weinberg? That’s just (p+q+r+s)^2 = 1, right?</p>
<p>are you talking about the hardy-weinburg on the free response?</p>
<p>semifinals were gay. they were easy + the cutoff will be so high. umm the one i didnt agree with that i saw up here was the amino acids that are easily phosphorylated…i put the answer with tyrosine (tyrosine kinase receptors anyone?) but maybe im wrong…</p>
<p>yeah nitrogen fixing bacteria was the answer for that one…</p>
<p>and K+ secretion occurs in the distal tubule if i remember from the diagram correctly. remember that reabsorption brings things back into the bloodstream but secretion secretes things into the nephrons tubules.</p>
<p>I put the same answer for that one, because of the tyrosine-kinase receptors. I guess we’ll have to find out when the results are released. I’ll agree with adid on the K+ secretion (I just looked it up). And yes, that 4-term HW was in the free-response section.</p>
<p>And about the semi’s being “easy”, I don’t think this’ll make much of a difference. Remember the people posting here are probably a horrible cross-section of the test-taking population. so its impossible to figure out the cutoff.</p>
<p>On an unrelated note, please don’t use the term “gay” as an insult, regardless of your views on the subject (ie, save the politics for another forum). I have friends who are homosexual, and that’s really offensive not only to them, but to an entire subset of the population.</p>
<p>adi, do you really want to be frozen again?
that’s really narrow-minded.</p>
<p>ROFL at addi and onomotopia(not at you guys, but at your conflicting responses). i hope your right about the cross-section thing (even though it did seem easy compared to last years). and about the kinase question, i was thinking of puttin tyrosine (b/c of tyrosine kinase recepetor) but it was tyrosine and glycine, and im pretty sure glycine isnt one of the kinase proteins. and i put proximial, because i thought most of all reabsorption, be it sodium, potassium, or water occurs in the proximial tubule. but, who knows, i could be wrong (and probably am considering my luck).</p>
<p>oh yeah and for the hardy-weinburg one i thought it was p + q + r+ s = 1, and the heterozygote frequences are 2pq, 2pr, 2ps etc. i did it that way, and my numebrs added up right.
and juist out of curiousity, what grade are you guys in?</p>
<p>ono, why are disulfide bridges formed in the cytoplasm?
i put in the ER. my chain of reasoning: disulfide bridges are in the tertiarty structure of proteins, most proteins are folded into 3d conformations in the ER, therefore the disulfide bridges are made in the rough ER.</p>
<p>im pretty sure the answer to that one is ER.</p>
<p>Ok moving away from the offensive comments and back to bio…</p>
<p>Yeah, it’s definetly ER. The ER is an oxidative environment which helps disulfide bridges form. The cytosol however is a reducing environment. Plus I remember using PDI (Protein Disulfide Isomerase), which is a chaperone protein that helps disulfide bonds form i think, as an ER marker in the lab. So yeah…</p>
<p>yeah definitely ER. yeah my friend ER is a protein modification center. kinglz is definitely right about the chaperone proteins (i.e. chaperonins) that facilitate proper structural secondary, tertiary (and we know disulfide bonds are important to this type of protein structure) development of some proteins.</p>
<p>scorcher- yes, most reabsorption occurs in the proximal tubule: salts, water, ions are reabsorbed here. they asked, however, for the location of SECRETION of K+ ions, which im very sure is the distal convoluted tubule.</p>
<p>so yeah thats my input.</p>
<p>and i AM pretty narrow minded, but whatever right? it doesnt matter, we’re all friends in our <em>biology family</em> right? lol jk, any more answer discussion is good, lets keep it going.</p>
<ol>
<li><p>what evidence would have best substantiated darwin’s theory?
the evidence that some species have become extinct
(i’m not sure about this.)</p></li>
<li><p>which substance would cause the most change when injected into the cellular cytoplasm?
i dunno this one</p></li>
<li><p>characteristics of an enzyme-catalyzed reaction
sigmoid-shaped graph</p></li>
<li><p>A<em>>B</em>>C. A negatively regulates B which negatively regulates C. How would the concentration of C change if A didn’t work?
Concentration would increase.</p></li>
</ol>
<p>Sorry, 18 should be conc. decreases.</p>
<p>What were the other options for 15 and 16? I remember the questions, but the choices elude me. I believe you are right on 17 and 18. </p>
<p>And WHEN ARE THEY RELEASING THE RESULTS? Grrr…</p>
<p>cee sends emails to the lucky 20, like golden tickets. </p>
<p>imagine that sitting in your inbox. mmmm…</p>
<p>Yo,
My bio teacher just got an e-mail from CEE. They say that the results will be released April 20. Just thought I’d let you all know.</p>
<p>yeah thats what my bio teacher said too.</p>
<p>pea_sea: yeah youre exactly right…theyre like the golden tickets in willy wonka and the chocolate factory.</p>
<p>if any of us make it that will be BAD ASS.</p>
<p>just got the call.
the first words i said over the phone were “HOLY CRAP ARE YOU SERIOUS?”</p>
<p>Aaaahhhhhhhhhhhh!!!</p>