<p>this whole thread is endoplasmic ridiculous!</p>
<p>Senior here, going to Georgetown in the fall.</p>
<p>I begged my counselor to not put me in AP Bio Senior year. Those pleas fell on deaf ears.</p>
<p>heh, my guidance counselor , for the first few months of junior year, used to say "nice to meet you" everytime I spoke with him. Mind you, I spoke with him (actually met with him in his office to discuss my plans, etc.) probably 5 times before he stopped saying that.</p>
<p>i don't even know my guidance councelor. i know my principal and my school super intenedent. it will be great for connections in future political elections.</p>
<p>looks like i've played this game well.</p>
<p>My guidance counselor is one of my favorite administrators at my school. He knows both my family and me very well.</p>
<p>I also know the principal, although he knows my mother better than he knows me. </p>
<p><em>Does not comment on my school's superintendent...cough.</em></p>
<p>My guidance counselor encouraged me to take a rigorous schedule my senior year... regretting it. :(:(:(</p>
<p>so can we talk about the free response yet</p>
<p>yes its been 48 hrs</p>
<p>What'd you guys put?</p>
<p>For question 1, I was (and still am) thoroughly confused: are there any enzymes working during anaerobic glycolysis?? I thought that NADH and FADH were coenzymes. Anyway, for the design your own experiment I just talked about how pH and temperature affect the denaturing of enzymes (since they're proteins, and so their structures depend on the interaction of the R groups, which interaction is altered under temp. or pH changes). What was up with this question?...not that question 2 was any better.</p>
<p>For question 2, I emphasized the histone coils, which give the chromosomes their clumped shape. The evolutionary significance really stumped me ... I said that the clumped shape allows easy cross-over between tetrads during synapsis in meiosis I. I then of course compared it to the plasmids in prokaryotes, but could not find an impact--what is unique and inherent to the structure of chromosomes that give it a big distinction from plasmids? Obviously plasmids can be transferred from bacterium to bacterium (via transduction, e.g.), but how is that related to the structure of the plasmid--it seems attributable only to the lack of a nucleus (and instead only a nucleoid) in prokaryotes. Hm.</p>
<p>I don't even remember what question 3 was asking. It was something about angiosperms.</p>
<p>Question 4, I talked about nonspecific defenses, such as the skin and mucous membranes, as well as histamines and inflammation, phagocytes. I then spoke to the specific defenses, blah blah blah.</p>
<p>It's questions 1, 2 & 3 I'm really worried about...</p>
<p>im ultra worried about #4
we never got to the immune system so i just talked about leukocytes, phagocytes, mucus and blood levels of certain chemicals. im screwed.</p>
<p>I talked about basically the same thing for #1. Deviation from ideal temperature or pH causes denaturation because [insert long description here]. For the design your own experiment I said expected results would be basically the same as the temperature results (in terms of what the graph would look like). </p>
<p>Number 2 I talked about nucleosomes ("histone coils"), 30-nm fibers, and looped domains (300-nm fibers) making chromosomes compact. I also talked about centromeres and kinetochores. For impact I discussed the whole crossing over thing and then about making law of segregation feasible or something like that.</p>
<h1>3 I talked about the four whorls for part a (sepals, petals, stamens, carpels) and I threw in the A-B-C theory/hypothesis, or whatever it's called. (Did this question mention reproductive structures or terrestrial reproductive adaptation? because if it's the latter, i'm only going to get like half credit...) For part b i talked about bryophytes having flagellated sperm (meaning they have to be in a moist environment/are attached to water more than angiosperms), about them having a dominant haploid gametophyte stage, making them more susceptible to UV damage (since any mutations would be expressed and not have a chance to be hidden as in diploid sporophytic angiosperms), and about bryophytes not having a vascular system, forcing them to be only a few cell layers thick and (once again) confining them to a damp environment. part c i just drew a diagram and put little numbers on the diagram to refer to in my answer. pretty basic regurgitation.</h1>
<h1>4 i did what you did. we only spent one day in class going over it, but luckily i read the chapter. i couldn't remember the word "agglutinated" though and talked about "globs" - real scientific...</h1>
<p>What kind of essay would typically score a 5/10? How detailed would it be?</p>
<p>for me, #1 was like 5 sentences for letter "C"</p>
<p>umm number 3....part a...i had put petals, stigmas, true fruits because animals spread there seeds when they uh yeah. can't remember wut i put for my 4th. would true fruits and petals be accepted even though they aren't directly involved?..those r the only 2 i distictly remember reading in the campbell reece book that had a full explanation of its evolutionary importance.</p>
<p>I put petals, pollen grains, fruit, and ovules for 3a</p>
<p>OMGYESSS we can finally talk.
ok lol this is what i basically said for each question:</p>
<p>1) obv denaturing of enzymes (proteins) and i mentioned enzymes such as phosphofructokinase and hexicase that work during glycolysis
for pH i said it depends really on the enzyme cause they all have different ideal pHs (such as pepsin for example) but i said i presumed respiration enzymes functioned best at a neutral pH which was probably wrong but whatever mon</p>
<p>2) i didnt know if they meant chromatin or condensed chromosomes so i did both... i talked about histone proteins/nucleosomes/looped domans and then i talked about like telomeres and centromeres and sister chromatids</p>
<p>for the evolutionary significance i tried to bs it best i could by saying how dna being wrapped around histone proteins can be used as a mechanism to control gene expression and went on and on about how impt dna is. then i talked about how it helps in the distribution of genetic material to the zygtoe/gamete/offspring yeah you get it.</p>
<p>i had like 8947548 differenced between pro and eukaryotic chromosomes cause our teacher gave us a practice essay on it like a week before</p>
<p>3) totally bombed it. i could only come up with 3 flower parts (petals, stigma, and pollen/anther) so then i tried to bs by talking about the ovary and endosperm</p>
<p>mosses i know are non-vascular seedless plants and i <em>think</em> they reproduce by releasing gametes into an aqueous solution
i totally forgot alternation of generations -_-</p>
<p>4) really long and complicated. talked about cytotoxic/helper/memory t cells and b cells and the MHC and blah blah blah it was too long for me to type here lol</p>
<p>what does a memory cell do? lol i i made the most cliche answer like every1 else who didn't kno about it</p>
<p>memory cells are produced during clonal selection which occurs during the primary immune response... basically t and b cells divide and for effector/plasma cells that actually attack the antigen and then memory cells that live for a lot longer and have very specific receptors for that specific antigen so that the next time the antigen enters the body (such as the chicken box) the memory cells will quickly recognize it and produce many many more t and b cells and destroy the antigen before it can even cause symptoms</p>
<p>for* not form.. sorry</p>
<p>WOW ok i suck at life.. form* not 'for' haha</p>
<p>oh wait... for the last part of number 2, does this sound right?</p>
<p>PRO- no introns (obv no mRNA processing), not bound in nucleus (in nucleoid), contains 1/1000 amount of DNA than euks do, circular chromosome, they have plasmids, not bound to histone proteins and they use operons to regulate gene expression</p>
<p>EUK- introns, in nucleus, linear chromosomes, a lot of dna, and histone proteins</p>
<p>i feel like i just listed the differences between euk and pro genetic info rather than actually answering the question... any ideas? lol</p>