<p>Blebbing,
Whales and sharks are from different ancestors, but thats whatmakes them convergent as they have developed similar traits IMAO
Plant drawing is palisade mesophyll (site of phoyosynth.), vascular tissue, and stomata (dnt remember this one well, or cutcle)
Phloem question: it is infact companion cells. Sieve tubes depend on companion cells</p>
<p>Plant research - if it were during day produces more O2, level would have continued rising, but what they say is the level of 02 went up and down. So the answer is plants carry respiration at night.</p>
<p>Vine data doesnt confirm hypothesis, they dont grow at the same rates, much slower.
From neuron to muscle cell is a chemical signal. The action potential, which is an electric signal only runs along the axon. When it reaches the end of the axon and the signal is to be transmitted to another nerve cell or muscle cell, a neurotransmitter, usually actylcholine, is released which then triggers an action potential in the next cell.</p>
<p>why would Semipermeable membrane - H20 flows back and forth?</p>
<p>charafberdai:</p>
<p>Vine data: The hypothesis was that vines don’t require trees for nutrition, only for support. Data confirms this, so i believe i stand corrected.</p>
<p>Plant Research: You’re reasoning does not make sense because that ans. choice assumes that plants only respire during the night. My ans. is correct because it not only takes that factor into account, but also correctly states that there is higher O2 produced than consumed.</p>
<p>Muscle signaling: If we’re going to be technical, it’s actually an electrochemical signal. I’ll concede that some muscles require chemical signals, but for the most part, it’s a result of neurons sending electrical signals through an action potential.
[YouTube</a> - How a muscle contraction is signalled - Animation](<a href=“How a muscle contraction is signalled - Animation - YouTube”>How a muscle contraction is signalled - Animation - YouTube)</p>
<p>Convergent Evolution - You’re right.</p>
<p>Semipermeable membrane - proteins can’t cross membrane, so H20 flows back and forth to maintain dynamic eq.</p>
<p>If the nutrition aspect did not affect the trees then they would grow at the same rate on the fake ones and on the real ones so because they did not grow at the same rate this proves that they do depends on the tree for more than support.</p>
<p>For semipermeable membrane, water crosses to the side with proteins, and stays there. Osmosis is an equilibrating force, so no need for going back and forth to create equilibrium.
For the neuron, if you watch the video in the beginning, it states that calcium ions are what is released, it is the neurotransmitter in this case. Ofcourse a calcium ion, is a chemical and is what triggers the depolarization of the muscle cell and attaches to actin to allow contraction.
Plant research i agree.
What was the data for the vines. All remember is they didnt grow the same way. The only difference between the two (artificial and real tree) was not tallnes, its having nutrients (alive or dead). So if they didnt grow at the same speed and the same height, how is that?</p>
<p>here is a link for the muscle contraction: [Neuron</a> - Biology Encyclopedia - cells, body, function, human, process, system, different, organs, used](<a href=“http://www.biologyreference.com/Mo-Nu/Neuron.html]Neuron”>Neuron - Biology Encyclopedia - cells, body, function, human, process, system, different, organs, used)<br>
read the paragraph under functions and classification.</p>
<p>in the vine question the control group grew alot taller than the experiment group so therefore, the author’s hypothesis would be incorrect because the vines clearly not only needed the trees for support but also nutrition for growth</p>
<p>^^ So the authors hypothesis would be that the vine would grow at same rate in both experimental and control group. And his hypothesis would be proven wrong by the data.</p>
<p>thanks for the list, Blebbing. I don’t agree with all the answer choices you have, but I do for most (: the neurotrans. was ambiguous, I thought. If you studied, then you know that it’s “electrochemical”, so I don’t know what the “best” answer was! </p>
<p>Also, animals clump so that they can benefit from each other, right? What better way to do that then to produce babies? lol fighting for food would be no cause to clump, and it would only be very temporary, as the food will run out quickly. Mating is what I had</p>
<p>It’s what i had too Rainbow… </p>
<p>By the looks of it… 7 omitted, about 5-6 wrong</p>
<p>for me, it’s about 4 omitted and based purely on the list, about 3 wrong (but there probably are more since I took E and wasn’t sure about quite a few questions)</p>
<p>aiming for 700+ (yeah I’m not really hoping for much lol)</p>
<p>“Bicarbonate serves a crucial biochemical role in the physiological pH buffering system” </p>
<p>buffer!</p>
<p>“Mice :Litter - must be from same litter” < I g0t food-anyone else?
“Chromosome attached at one end - ans. choice B, i think?” < I g0t that too</p>
<p>I got food.</p>
<p>As for the chromosome one I got the weird one that was sort of near the end.</p>
<p>yeah, that one was hard. I was deciding b/n the 2nd and last one
I’m going to send my Dec Bio score after I see results, since I’m taking another subject test in January. I might as well send my SAT Reasoning before Jan 1, and all my subject tests after I take Jan 22 subject test. Do you think this is okay? (the schools I’m applying to all say it’s fine to send Jan scores: most Ivies, JHU, Stanford)</p>
<p>guys, what does a 71 raw score translate into?</p>
<p>according to my CB book, a 71 = 760</p>
<p>anyone know if the curve is pre-determined? does someone want to make a projected curve for December bio?</p>