2009 ADA Test Incorrect?

[BrazilianRider]

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Dunno if I'm allowed to ask this, so if not, please delete mods!

My DAT is on Monday, and I took the 2009 ADA Test yesterday and got 20+ in every subject, but there were two problems that are marked "wrong" that I think are right...

The first is #14... isn't the major INTRAcellular buffer Phosphate, and the major EXTRA/INTERcellular buffer Bicarbonate?

The second is #80... Isn't sp3 a tetrahedral at 109.5 degrees? Why does it say the answer is 120 degrees?

Thanks a ton guys, and sorry if this isn't supposed to be here!

 

[mardr2b]

There is a thread somewhere where it says all the right answers for 2009 ADA it has mistakes.

 

[quackwhacker]

You are correct, I think they intentionally made some answers wrong (idk why).

 

[sjv]

http://forums.studentdoctor.net/threads/2009-dat-sample-test-errors-confirmed-by-ada.828825/

 

[BrazilianRider]

http://forums.studentdoctor.net/threads/2009-dat-solutions.1064144/#post-15099066

I saw this one as well. Apparently there are different versions of the exam, because mine definitely has an sp3 carbon on there, not sp2.

 

[BYU4you]

Just finished taking the 2009 test and I ran into these errors to that weren't on the "known errors" sheet. Can someone confirm?

It seems that for #80 there are multiple versions some with sp2 and some with sp3 hence the problem with angles.
And also with the bilogy problem, it says that Bicarb is the intracellular buffer as opposed to phosphate.

I have questions about #91 as TLC being used to separate non-volatile compounds (I thought it was only used to distinguish polar differences and that you would use steam distillation)
Also I read on some old threads about#99 being a super wacky question with the product containing Br's but no reagents in reactants have Br on them.

Also if anyone has used the 2009 Test #6 on the keyhole PAT looks like answer has pretty wrong dimensions.


If anyone else has encountered this feel free to chime in!


(And if anyone has taken the real DAT please tell me the QR and RC sections are easier haha)

 

[BYU4you]

Also, the question about home growth in bones. Answer is epiphysis but I've read it is at epiphysis plate which is actually in the metaphysis (a wrong answer). Any clarification? @FeralisExtremum

 

[FeralisExtremum]

I never purchased the full test so I can't help with most of these, but you are right that the epiphysis plate is in the metaphysis, it's a very tricky question because of the anatomic overlap and the fact that there's kind of growth everywhere: diaphysis growth in diameter, epiphyseal plate growth, and epiphysis growth of the cartilage around the epiphysis:

 

[PocketRocket]

I hear you with regards to PAT, I remember thinking there must be a couple of errors there. For the orgo question on non-volatile substances: the reason we use TLC is because it separates non-volatile substances based on polarity. Distillation requires for substances to be in the gas phase. Non-volatile substances can not be in the gas phase. Non-volatile simply means that it can not vaporize. Hope that makes sense!

With regards to RC and QR, from what Ive heard, the actual DAT is a little easier. I remember the QR containing a few weird problems where I didn't even know where to start. Sort of reminded me of DAT bootcamp QR

 

[BYU4you]

I hear you with regards to PAT, I remember thinking there must be a couple of errors there. For the orgo question on non-volatile substances: the reason we use TLC is because it separates non-volatile substances based on polarity. Distillation requires for substances to be in the gas phase. Non-volatile substances can not be in the gas phase. Non-volatile simply means that it can not vaporize. Hope that makes sense!

Isn't that what steam distillation is for, so that you can separate things at lower temperatures than they normally would go into gas phase due to the water around them?

I was just under the impression that TLC doesn't really help you separate but let's you know more about what you have and if you even need to purify etc.

 

[PocketRocket]

Isn't that what steam distillation is for, so that you can separate things at lower temperatures than they normally would go into gas phase due to the water around them?

I was just under the impression that TLC doesn't really help you separate but let's you know more about what you have and if you even need to purify etc.

I thought the same exact thing at first but I think there is a destroyer problem that deals with this issue. I actually just found it lol. Number 20 in 2015 edition. It defines TLC as "A means of separating non-volatile mixture components in a sample". Also #256 states that its a separation technique. I just remembered that and went along with it to be honest. It would make sense that TLC is an analysis only technique because you're really only applying a small sample of the substance on to the TLC plate. And from what I remember from orgo lab, we always just discarded the TLC plate after the experiment along with the analyte.

 

[bluesky12]

Definitely errors in the test.