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by NS_Tutor_Andrew
Fri Feb 23, 2018 8:03 pm
Forum: Post Questions About Exams and QBank
Topic: FL9, Psych/Soc Section
Replies: 5
Views: 37

Re: FL9, Psych/Soc Section

Thank you, and very glad to be of help!!
by NS_Tutor_Andrew
Fri Feb 23, 2018 7:57 pm
Forum: Post your questions here about any videos in the class
Topic: Lesson 7, Video 5, Slide 9 (last slide) - Amino Acids
Replies: 1
Views: 10

Re: Lesson 7, Video 5, Slide 9 (last slide) - Amino Acids

Hi Cheng, Yes, you're basically right, although cysteine and tyrosine are both interesting molecules in terms of polarity. For cysteine, the S-H bond actually falls below the threshold usually used to define polar covalent bonds, with an electronegativity difference of 0.38, but it is usually consid...
by NS_Tutor_Andrew
Fri Feb 23, 2018 7:51 pm
Forum: General Discussion & FAQ
Topic: Chem/Phys Full length Sec 6 Passage 5 Q23
Replies: 1
Views: 7

Re: Chem/Phys Full length Sec 6 Passage 5 Q23

Hi Maria, The idea basically is that changing the pH means changing the concentration of H+, and we see from the table that changing [H+] by a certain magnitude changes the reaction rate by an equal magnitude, which is consistent with a rate law of rate = k[A], where A = H+. We're changing the corre...
by NS_Tutor_Andrew
Fri Feb 23, 2018 7:02 pm
Forum: Post your questions here about Next Step's MCAT books
Topic: Chem/Phys Book. chapter 1
Replies: 6
Views: 91

Re: Chem/Phys Book. chapter 1

Hi gammcurdy,

Essentially, the right triangle is the result of vector addition. I've attached a diagram sketching this out -- hope it helps!!
by NS_Tutor_Andrew
Thu Feb 22, 2018 2:56 pm
Forum: Post Questions About Exams and QBank
Topic: FL9, Psych/Soc Section
Replies: 5
Views: 37

Re: FL9, Psych/Soc Section

Hi khadeja, For Q8, basically we have to go back to the experiment, look at what they're measuring, and try to figure out possible weaknesses in the study design. The Q is essentially giving you a potential objection to the study's findings, so our question is basically "what kind of problem is...
by NS_Tutor_Andrew
Thu Feb 22, 2018 2:46 pm
Forum: General Discussion & FAQ
Topic: concept clarification, D/L vs. R/S enantiomers
Replies: 1
Views: 15

Re: concept clarification, D/L vs. R/S enantiomers

Hi Taelor, Thanks for the excellent question! Yes, you're right: d/l (+/-) and R/S have nothing to do with each other. You have to figure out d/l (+/-) experimentally, whereas R/S can be determined based on the structure of the molecule, which is why it's called the absolute configuration. In terms ...
by NS_Tutor_Andrew
Thu Feb 22, 2018 2:15 pm
Forum: General Discussion & FAQ
Topic: NextStep MCAT Full Length#4 Q#15
Replies: 2
Views: 23

Re: NextStep MCAT Full Length#4 Q#15

Hi tocgrace, Excellent and very thoughtful question -- kudos to you for investing so much time into working through the question :). For this question, I think it's best to break it down into steps. Step 1: We have a GCTA/GCTA molecule, replicated with G'C'T'A. This will yield two GCTA/G'C'T'A molec...
by NS_Tutor_Andrew
Thu Feb 22, 2018 1:16 pm
Forum: General Discussion & FAQ
Topic: C/P Strategy book ?
Replies: 1
Views: 16

Re: C/P Strategy book ?

Hi PoincareConjecture, That's an excellent question! I'm very fond of that passage, but please understand that it's really hard -- we've used it before in office hours sessions specifically dedicated to difficult physics passages, and there's a reason for that. The issue re: #1 is that the y-axis in...
by NS_Tutor_Andrew
Mon Feb 19, 2018 2:18 pm
Forum: General Discussion & FAQ
Topic: Mistake here
Replies: 4
Views: 51

Re: Mistake here

Hi MCAT_Retaker, You're absolutely right about the inheritance pattern -- should be "heterozygous", and we'll fix that promptly. Re: the wording on Q4, the idea is definitely that the concept of "incomplete dominance" applies to the example of the pink flowers, NOT to sickle-cell...
by NS_Tutor_Andrew
Mon Feb 19, 2018 2:10 pm
Forum: General Discussion & FAQ
Topic: Ideal Gas Law Question
Replies: 1
Views: 14

Re: Ideal Gas Law Question

Hi staciai, I think you're thinking about this correctly. The key thing about Boyle's law is that it holds at a constant temperature . Similarly, Charles' law holds when the pressure is constant. PV=nRT is the equation you need to use if you're accounting for all three variables. Hope this clarifies...

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