[Video] Q25: The authors’ main purpose of including the information about x-ray evidence and density is to

Explanation for Question 25 From the Reading Section on the Official Sat Practice Test 1

Twenty-five asks the author's main purpose of including the information about x-ray evidence in 2 density is to do what well, 3 where is he including information about x-ray evidence and density? 4 I think he talks about that over. 5 Let's see, one second. 6 I'm trying to look for it myself. Um, 7 um, let's 8 see. What, so let's see firstly, 9 to for structured. Uh, 10 okay. So the density suggests that there's two chains, 11 um, 12 and the evidence of just the stuff about the hydrogen basis. 13 So I think that's the reason why he's, um, including that information to kind 14 of confirm the special qualities that the, 15 yeah, yeah. It's basically about the evidence and the density right here. 16 We do it to prove that there is, there's very strong evidence that there 17 are two chains instead of one chain. So that's what we're trying to prove 18 here. Um, which one talks about that? There's two chains. 19 C C is the only one that talks about two change C says provide 20 support for the author's claim about the number of chains in a molecule of 21 DNA. We're using the density argument and the density evidence to 22 prove that there's two chains. That's the only way we proved it. Right. 23 Nothing else proves that. Um, so that's the reason why I'm including it. 24 There.