[Video] Q31: Based on the table, is the percentage of adenine in each organism’s dna the same or does it vary, and which statement made by the authors is most consistent with that data?

Explanation for Question 31 From the Reading Section on the Official Sat Practice Test 1

Okay. So number 31 says based on a table, 2 is the percentage of adding in each organisms DNA the same, 3 or does it varies? That's the first question. That's going to be easiest one 4 to answer. So let's first answer that. Does the percentage of atomy vary or 5 is it the same? Well, let's just look at this column. 6 This is the adenine column and look at, 7 it's not the same. I mean, the lowest one that we have here is 8 like 24. And then the highest one we have here is 32 or 33. 9 So obviously it's varying, you know, 10 if it was always 24, 24, 23, 23, 24, 24, 11 that would be the same, but no, it's definitely varying. 12 So, um, we're gonna even be able to get rid of a and D 13 right away. Cause they'll say that they're the same. And now we're down to 14 C and D. Now, where is the evidence for that? 15 It varies. Well, it's going to be between lines 36 and 45. 16 So let's see which one of those lines is evidence of that, 17 that the adenine various. So 36 is over here. 18 Um, we start over here. 19 Any, for example, can occur on either chain, but when it does its partner 20 on the other team has always be diamond. This is not saying it varies, 21 right? So it's going to have to be the other evidence which is going 22 to be over here. Um, 23 if the actual order of the basis has one on one of the pair 24 of chains were given, one could write down the exact order of the basis 25 on the other one, because this one is specific pairing, 26 oh, wait, what, what number was it? Hol...