AAMC Official Guide to the MCAT 2015 CHEM/Physics Q 19.
Hi, Can someone explain q19 from AAMC Official Guide to the MCAT, the one about bacterial cells synthesizing PE?
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aldosterone and vasopressin
Do each of these hormones affect both the distal tubule and collecting duct in the nephron? I was initially under the impression that aldosterone helped to retain sodium in the distal tubule and that...
View Article2015 TBR Bio Passage Question: Retinal Projections
Hi everyone. I'm reviewing a practice passage in the 2015 TBR Bio I book and am very confused about an answer explanation. Chapter 1, Passage VIII, Question 52. "As part of a routine eye exam, the...
View ArticleSNS/PNS and vasoconstriction/dilation
Ok, so I always get these mixed up: What effect does the sympathetic nervous system (SNS) and parasympathetic NS (PNS) on constriction/dilation? If I remember correctly: Vasodilation happens with the...
View ArticleTBR Gen Chem Section 3 Passage 2
Hi everyone! This is my first time asking a question regarding MCATs on SDN so I hope I'm doing this right! I am confused with a particular question: Reaction: H2(g) + Br2(l) → 2 HBr(g) Mixing 3.0 atm....
View ArticleAcidity strength upon adding hydroxyl group
Is acidity strength increased or decreased when a hydroxyl group is added adjacent to the OH group in 2-hydroxyphenyl acetic acid? In this case the acid functional group is not attached directly to the...
View ArticleTBR Ultraviolet/Visible Spectroscopy
I have a few questions about UV-Vis. TBR states, "Because σ-bonds are so much stronger than π-bonds, the lowest energy absorbance for alkanes is significantly higher than the lowest energy absorbance...
View ArticleIonic vs Covalent Bond Strength
sorry, I know this is a question I should know but if someone could clarify it would be greatly appreciated..... Isn't an ionic bond stronger than Covalent bond? ionic bonds are due to a coulomb force,...
View ArticleRadius: Flow rate vs velocity
I need just quick help with some physics fluid stuff. I noticed increasing the radius by 2 would increase flow rate by 16 (2^4), but the velocity by 4? Is this typically the case? Its Radius^2 for...
View Articlemaximal frequency of recombination
Is the maximal frequency of recombination 50%? I was thinking that it could theoretically be 100% if all offspring are recombinants. Also, is recombination frequency only applicable when genes are...
View ArticleBiochemistry co-transpoters
I am confused about this questions. 1. Shouldn't the equation in the solutions be [Na]in/[Na]out? Why are they using it the other way around? Here is the equation that I got from my textbook: View...
View ArticleGibbs free energy equation
I am trying to think of this equation in terms of graphs: G knot = -RT lnkeq What kind of graphing relationship exists between G knot and keq? How would you plot it?
View ArticleEffect of mass on kinematics?
I honestly am so confused because from what I learned mass has no impact on the outcome of projectiles as two are launched they should land at the same time. Some questions, however, say that the...
View Articleestrogen levels throughout pregnancy
Progesterone levels are maintained throughout pregnancy- first stimulated by the corpus luteum and then by the placenta. Are estrogen levels also maintained during pregnancy? If so, what stimulates...
View ArticleRemembering DNA and mRNA directionality?
Has anyone thought of a good method/mnemonic to remember how RNA polymerase reads DNA from 3' to 5' and peptides are translated 5' to 3'? For whatever reason, this is one of those concepts that have...
View ArticleInduction signals
I was studying embryonic development today and I was trying to determine the composition of induction signals, just to obtain a deeper understanding. Are they hormones? Sent from my iPhone using SDN...
View ArticleKinematics
View attachment 200006 In the solutions, they use the conservation of energy equation to solve this. I am wondering why can't we use the big 5 equations here? At the top, v2y = 0, can't we use v2 = v1...
View ArticleDoppler Effect and Velocity
Hi guys, I'm hoping a better physicist than I can answer this question - the Doppler effect tells us that motion of either source or detector will cause a shift in perceived frequency. However, motion...
View ArticleSolvation and Ksp value
So, in EK chemistry book, they mentioned that for solvation reactions, even if temperature increases for a exothermic reaction, solubility increases. Does that basically mean that Ksp increases? This...
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