Official September 2013 ACT Science Thread

<p>can we discuss all of the questions on the phosphorous section?</p>

<p>Wouldn’t it have been 220 not 880? It asked for the one with the highest resistance, and since they all had the same volume, and the equation was I=V/R, the lowest I (220) would have the highest resistance. I don’t remember the exact variables, but I do remember resistance being in the denominator.</p>

<p>yes the resistance is in the denominator, but the resistance is the 880. they didnt give you current… they gave you resistance in the tables</p>

<p>The question asked which one had the most resistance, not the least, if I remember correctly. I think the answer is 220.</p>

<p>i dont think we are talking about the same question. i am referring to the one that asked in which trial which had the least amount of current? i picked the trial with 880 as its resistance become greater resistance means less current</p>

<p>What would -7 or 8 be?</p>

<p>what did you get for the last few? letter wise…</p>

<p>I got 15 Cs and Hs in total. Did anyone else get a lot of Cs?</p>

<p>I guessed C/H for the last three or so. Anyone remember/know if any of those are right?</p>

<p>Was that one thw length of the arc or just the distance between the two points?</p>

<p>can somebody explain the dna cutting one where it said if it was cut at A and B how many dna fragment(s) would be made and what numerical value they were worth</p>

<p>I can’t remember which one you’re talking about. If you meant the one where two cuts were made at RE1, the answer was 2 fragments which each had a value of 1,000.</p>

<p>If you meant the other one with a couple of cuts (I don’t remember the phrasing), the answer should have been 2 fragments, one of which had a value of 1375 and 625. I’m not sure if that helps or not.</p>

<p>Nspire -This is my strategy as well! I usually have time left and I feel pretty confident after taking the science portion.</p>

<p>I also got 1375 and 625 but i dont know where you hot the 1000s question.</p>

<p>No 880 had the greatest resistance thus making it the one with the least current.</p>

<p>Hopefully we’re done talking about the current and dna section… So can we discuss the phosphorus section now? Anyone remember any questions?</p>

<p>Jy I agree.</p>

<p>What did u get for the question about artificial rain??</p>

<p>Also what did u get on the question about DNA on which students were right and it gave the length of the fragment or something or it asked to use the electrophoresis?</p>

<p>I posted already that I put down that the density of the precipitous cloud increased but I think the other answer, that the p compound increased, was right. Do you remember the last question of that passage? It was something about which fertilizer did this which fertilizer did that, don’t remember what this and that were lol. All I know is I picked A out of desperation</p>

<p>On the DNA section, one question was which students were correct in the enzyme and plasmid used for experiment 2 where there was only 1 strip of DNA visible in the electrophoresis. It was student 2 and 3 I believe, (could be a off but it was 2 of the 3 students), because they chose the enzyme and plasmid that would cut the plasmid into two DNA fragments of equal length. Since electrophoresis separates DNA fragments based on length, the two fragments overlapped each other so it appeared like there was only one DNA fragment present.</p>

<p>Second jy’s opinion that students 2 and 3 were correct for the plasmid passage.</p>