June 2009 - Biology

<p>ah, negative feedback, trips up everyone. so some of us managed to get it right, because we stuck to the graph even if it went against what we learned. phew.</p>

<p>the answer to that one bigbuddy was they both produce ATP</p>

<p>They both produce ATP. That one was easy.</p>

<p>what is a good Score Conversion chart to use?</p>

<p>there was one question like what do an adult insect and a crustacean have in common? what was that answer?</p>

<p>what about the lab that involved inhibition of protein synthesis? what were the answers for those ones in the M section</p>

<p>I got 3 wrong right now… I think I got a 7something… I’m shooting fr 700</p>

<p>“there was one question like what do an adult insect and a crustacean have in common? what was that answer?”</p>

<p>I put that they both exprience external fertilization.</p>

<p>i put external fertilization too
although i wasnt sure whether all insects and crustaceans have exoskeletons</p>

<p>i thought it was grasslands because the majority of wheats and etc. are grown in grasslands, which also take up much more space than tropical rainforests</p>

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<p>But my reasoning actually makes more sense. I know you undoubtedly interpreted the graph correctly, but when you read what the question is asking what i said more sense. Ignoring all graphs, which is what I realized I should have done in the first place, I thought about those question. Saying the calcium levels decreaed makes the incorrect assumption the PTH directly influences calcium levels when in fact it is the other way around. As indicated on the graph by the independent and dependent variables and various other resources. So if PTH was decreasing, that clearly indicates that calcium levels must have been increasing.</p>

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I put chitinous exoskeleton. External fertilzation is wrong since they both experience internal fertilzation.</p>

<p>they both have segmented joints.</p>

<p>What was the question for the graph about the mRNA and protein? What was the prediction of the third graph?</p>

<p>insects/crustaceans –> arthropods —> chitinous exoskeletons</p>

<p>I agree with your logic, and that’s what I put, I think. You can interpret that through the graph as well.</p>

<p>everyones giving different answers for the insect/crustacean one…is is segmented joints, external fertilizaiton, or chitonous exoskeletons?</p>

<p>For the second PTH question I’m not completely sure that the correct answer is either decrease or increase. The question asked something like “If the parathyroid glands were removed, what would happen to blood calcium levels?” and I said that they would fluctuate greatly because I assumed there wouldnt be PTH to regulate them through negative feedback so calcium levels would be entirely based on how much calcium is consumed. I guess the flaw with that is that calcium levels are also regulated by calcitonin, but since that only lowers them I still think they would be fluctuating.</p>

<p>Also I wasn’t sure between inorganic compounds and vitamins for the fertilizer question, why couldn’t it be vitamins?</p>

<p>Oh shoot, the Internet says it’s chitonous exoskeletons.</p>

<p>i believe they have segmented BODIES not joints. unless the two are the same…i’m nearly positive about the exoskeletons, all of them def. have them.</p>

<p>i put chitinous exoskeletons because both are arthropods.</p>

<p>wow
I don’t even remember segmented joints being an answer
why wouldnt it be external fertilization?</p>

<p>what did an angiosperm and a gymnosperm have in common?</p>