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<p>Which still implies that directional growth had occurred in at least one of the plates (plates 2 or 3). I’m not sure why anyone would add an substance denaturing the protein responsible for directional growth if there wasn’t directional growth in the first place.</p>
<p>It was not directional growth in plate 2. This is all a hypothetical experiment, it doesn’t have to make sense out of the context of conceptual biology. The procedure isn’t what’s important. It’s the results. You can’t assume otherwise.</p>
<p>Growth towards a certain stimuli. Certainly, 1 or 2 may have been positioned to seem as if it was directional growth. But true directional growth would have all of the sprouts growing towards the center. What differentiates 1 sprout from another? We don’t know that.</p>
<p>In plate 1, the pollen tubes were radiating outward. In plate 2, the pollen tubes were growing outward in three directions. In plate 3, two pollen tubes collided. Pollen tubes are supposed to germinate and go down the style of a flower. I’m not sure if running into each other helps achieve that goal. </p>
<p>In any case, perhaps I missed this question. That’s 2 wrong for me.</p>
<p>I think I have 2 wrong too, as well as 1 skip. Relax, you’ll be fine. Expect a high 700 or possibly an 800.</p>
<p>Another question: Was the answer for the essential thing for spermatogenesis the luteinizing hormone spike or the separation of homologous chromosomes?</p>
<p>Separation of homologous chromosomes. That’s part of the process of spermatogenesis (It’s a step of mitosis, then meiosis 1 which is where that separation occurs and then meiosis 2)</p>
<p>Are SAT Subject Test questions sometimes not counted? I know that on SAT I a few questions aren’t used to calculate the final score if too many people miss it or something.</p>
<p>I don’t think that’s the case… I’ve never heard of that</p>
<p>Does anyone remember the other answer choices for occurs in mitochondria? I know it’s the Kreb’s Cycle but cannot recall putting Kreb’s cycle as an answer choice…</p>
<p>Also why did yeast work best at a pH of 6? I thought the graph indicated it worked best at 7? Oh god, if I read the graph wrong…
And in the same section, what was the answer to what conclusion can best be made or whatever? Was it that yeast makes it slightly acidic or whatever? I heard people debating that it’s it takes 30 mins to acclimate but I seem to remember some of them starting to show activity before then??</p>
<p>what was the yeast question? was it in M? i dont recall that question for some reason</p>
<p>yeah I don’t recall the yeast question either, also for the best source of energy question, was it a starch or a fat? I put starch.</p>
<p>For the yeast question I answered that it took 30 mins</p>
<p>For the spermatogenisis not sure if it was spike in LH or meiosis ( FYI the LH hormone is responsible for inducing spermatogenisis and is vital to the process)
Insects also can’t see infrared radiation right?? Can’t remember the question properly…</p>
<p>Guys is -3 or -4 still equal to an 800 or what?? 
doubt it but still. June sat had a very generous curve (-5 was an 800) and wasn’t that hard… I dunno. Really wanted an 800 though :(</p>
<p>@aznsat i can confirm your answer for the worm question</p>
<p>does somebody know how many right answer to get an 800</p>
<p>Spermatogenesis was meiosis. Fat was the best source of energy.</p>
<p>Was the activation energy the amount of energy required to change a reactant’s bonds or to bring reactants together?</p>
<p>@katzly did you put glycolysis or photosynthesis? For the yeast question, I was debating between 6 and I think 7? I put 6 because not only did it reach the highest y values, but it took the least amount of time. Also, for the other question I put the 30 minute answer… None of the others make sense. According to the graph, varying pH’s affected yeast activity, not the other way around. </p>
<p>@ladyrainicorn I feel like the two answers are almost the same, put i chose the former because before a reaction occurs a catalyst needs to change the bonds of the reactant’s bonds… “Sometimes this happens because enzymes might weaken a covalent bond within a substrate molecule. In other cases this lowering of activation energy seems to happen because the enzyme holds the substrate molecules in a particular position that increases the likely that the molecules are going to react.” [What</a> is activation energy biology? - Yahoo! Answers](<a href=“Yahoo | Mail, Weather, Search, Politics, News, Finance, Sports & Videos”>Yahoo | Mail, Weather, Search, Politics, News, Finance, Sports & Videos)</p>
<p>Were the two last questions A, A ??
Can’t remember, can anyone confirm?
Also, curve prediction?? Anyone?</p>
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<p>LH and FSH are both needed for spermatogenesis. The LH spike, however, is only needed for ovulation.</p>