<p>Yeah…the progesterone was to maintain pregnancy. I said that the white part did not have chloroplast since it was not carrying out photosynthesis(no starch which means no glucose)…I could be wrong on that though. That one made the most sense because the question made it a point that starch was not being produced which to me directly suggested they were looking for photosynthesis/no photosynthesis–>Chloroplast, no chloroplast.</p>
<p>Does anyone remember the weight of each frq??? I remember seeing the number 10% and 7%, can anyone confirm??? I forgot the weight of the long essay, especially</p>
<p>I had form O and found it extremely easy…I finished the MC and calculations with 20 mins to check and the FRQs were pretty simple</p>
<p>For the fruit fly stuff… Could you say that gene flow was a source of genetic variability? When I looked at your guys’ answers regarding crossing over, random fertilization, etc., I got a bit worried .____. … If you think about it, though… It makes sense, doesn’t it? Introducing new genes to create variety?</p>
<p>that’s what I said…the correction of mutations could introduce new genes and create more variation. Maybe that was too simple but it kinda works. Anyways, I got the gimme genetic variation to evolution relation so that question wasn’t a total loss</p>
<p>Did question 1 ask for a control or control variable for part c?</p>
<p>So for the trichome question, herbivory was the IV because that is the variable that the scientists change. Scientists cannot control the trichome density on a plant - that is dependent on herbivory. Its basically verifying natural selection.
The pedigree one was mitochondrial, I’m like 99% sure - all offspring of affected females were affected, none from affected males. That made the most sense.
The chloroplast one I put that only the green areas contained chloroplasts (because only they would photosynthesize->produce glucose to be made into starch. Plant fat is usually in the form of oils (because it is not very saturated and therefore liquid because of kinks in the plasma membrane), so I eliminated the fat answer, and the rest just did not seem plausible.
And I put it was an ectotherm because temperature shared a direct correlation with o2 consumption rate (and therefore respiration rate)</p>
<p>also overall I thought the MC were easy but I was too pressed for time on the FRQs to concentrate</p>
<p>Anyone that had form O, what did you write for the question about building the park? Part A was like “if they cut down all the trees, what will happen to the plant population” and i said the pop. on the then-forest floor would grow because the trees are no longer blocking their sunlight or some crap…Part B all I said was that runoff into the watershed would kill animals, seems reasonable to me.</p>
<p>A lot of people have been arguing about the ectotherm/endotherm question, which I explained in question 3 of my document:</p>
<p><a href=“Answers to Major Questions in the 2014 Bio Exam - Google Docs”>https://docs.google.com/document/d/1oNrVvy_c7FPg3muqvIzm8QbZesuW_q1bArkZVXkeqHA/</a></p>
<p>But I’ll try to answer the major points here about it too.</p>
<p>First of all, @Martin18 : the example that you linked uses a frog, an endotherm, and a dog that has specifically been poisoned with curare, to demonstrate its loss of the ability to maintain its own metabolism, like an ectotherm.</p>
<p>Our metabolism does not increase in the heat for sweating and panting. A byproduct of metabolism is heat. The last thing that you want in the heat is to bring your metabolism up too much, because it makes you even hotter. In the cold however, we tell people to run around to keep warm, because exercise increases your metabolic rate, which produces heat.</p>
<p>The graph sloped upwards. One key feature of ectotherms is that their metabolism increases with the temperature, because they cannot regulate it themselves. Google “torpor” for the effects of low temperatures on a reptile’s metabolism. In fact, and endotherm’s graph would’ve sloped the other way-downwards.</p>
<p>In cold temperatures, an endotherm’s metabolism increases to stay warm, so the O2 consumption should’ve decreased as the temperature increased.</p>
<p>As for the pedigree question, I also answered that in the document that I linked above.</p>
<p>Yes, mitochondrial-linked diseases are possible. Wikipedia has a whole article on a bunch of them.</p>
<p><a href=“Mitochondrial disease - Wikipedia”>http://en.wikipedia.org/wiki/Mitochondrial_disease</a></p>
<p>Hope this helps!</p>
<p>On the one about genetic variation in the engineered flies…for some reason my brain did something weird and I said transposons. I know it’s offbeat, but they should still accept that, right? </p>
<p>I think the experiment question with the trichomes was open ended…hopefully as long as you argued your points and made sense you will get something. If you are trying to prove that trichome density is better against predators, then I think initial trichome density is an IV and resultant trichome density or survival of plants in the DV. Herbivory remains constant…scientists can’t change the original trichome density of specific plants, but they can probably set it up so that certain groups have higher trichome densities and to see how well they survive. Basically I said that if the hypothesis is correct, plants at the end of the experiemnt should on average have a higher trichome density than the original trichome density of the population. I thought that made sense. </p>
<p>Wait for question 8 couldn’t you have just said that the variation was due to random mutation via exposure to something like ultraviolet light?</p>
<p>Was the endotherm/ectotherm question out of 3 or 4 points? I’m hoping it was out of 3.</p>
<p>@martin i think it was #4 so 4 pts. i could be wrong tho (have been a lot on this thread lol)</p>
<p>any way they throw out a FR question? Unless they are really open ended with the grading I guess a fair amount of people will crash and burn on the first FRQ for form O.</p>
<p>@schakrab I think i did: messed up variables, control, graph. I think the last part was easy though (what results would support our hypothesis?) But yeah, I’d love if they dropped that one, but i don;t see it happening. If you look at past breakdowns, some questions had an average of 3/10 (i saw a .9/4)</p>
<p>who started this rumor about dropping a FRQ? its not happening. If anything, they’re going to drop a few MC questions and a grid-in, because that’s what they did last year. If you look at the 6-page CB document write-up about the 2013 exam grading, you’ll see that part I was only out of 58, not 69. Part II however, still had all 8 FRQ.</p>
<p>the ectotherm/endoderm one was #7, so only 3 points</p>
<p>Even if you messed up…number 1 was still an open ended question for the experiment one so I don’t think the right/wrong answers will be set in stone. </p>
<p>@remembrance I can dream, no? haha</p>