Answers to 2008 quiz

[Sabin Shah]

Hey, 

Thanks to lucy to sending out that quiz. Here are the answers i got, does anybody find anything different? I wasn't sure on a couple:

1.A

2.B

3.B

4.C

5.A

6.C

7.C

8.D

9.E

10.A

gluck studying

[Candice Thompson]

Hey Sabin,

We got some different answers:
1.E
2.B
3.E
4.C
5.A
6.C
7.A
8.C
9.D
10.A

[Sabin Shah]

Why is PEP the high energy compound?

[Sabin Shah]

And how do you get the polypeptide charges to add up to -2? I had +4 (His/lys/lys/Arg) and -3 (Glu/Asp/Asp)

 And why would it be 4 fragments not 5? I had the trypsin cleaving at 3 and the cyn bromide cleaving at 1

[Sabin Shah]

and the method i wasnt sure about, are u sure?

[Candice Thompson]

I'm pretty sure about the method.  Question number one was AMP, sorry.  Histidine is neutral at physiological pH.

Candice

[Candice Thompson]

7.B; Histidine doesn't count at pH 7.4
8. It cleaves in four places=five fragments.

[Talavari Yousef]

I agree with Candice on Q9 but not Q7.for Q7 the answer is C. Zero charge.

Lys/Arg/Arg/ - (Glu/Asp/Asp)

 

Also for Q1 the answer is E. because PEP free energy is about -62(very high negetive) but as we know AMP is low energy because it has only a phophoester bond that makes AMP stable.

 

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From: Candice Thompson <candiceth...@gmail.com>
To: hucm-20...@googlegroups.com
Sent: Wed, August 3, 2011 8:47:00 PM
Subject: Re: Answers to 2008 quiz

[Candice Thompson]

Question 7 has:
Lys/Arg/Arg/ - (Glu/Asp/Asp/Asp)=-1

I think you guys missed one Asp.

Candice

[Xiaolu Xu]

I agree with Candice for #7 (-1)

I concur with Yousef for #1 (PEP) cuz it seems that all the other answers only have 1 phosphate group?

[Talavari Yousef]

thank you Candice.you are right!!

By the way, I am pretty sure that Q3 answer is E not B. Because stucture E doesn't have any chance to have an open chain to produce aldehide but structure B can. Its right side ring can be open at anomeric carbon and produce an aldehide.

 

Yousef

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From: Candice Thompson <candiceth...@gmail.com>
To: hucm-20...@googlegroups.com

Sent: Wed, August 3, 2011 9:25:25 PM