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June 20, 2025, 03:52:18 am
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Author Topic: TSSM 2010 MC Q19  (Read 2481 times)  Share 

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naved_s9994

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TSSM 2010 MC Q19
« on: June 06, 2010, 04:48:08 pm »
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I thought ther'd be only two. Answers say 4?

NH2 into the Carboxy of another,,,, then the other carboxy, in to the other NH2 ?

What have i missed??
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Martoman

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Re: TSSM 2010 MC Q19
« Reply #1 on: June 06, 2010, 04:56:18 pm »
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You can have L-L-L
                   L-L-P
                   L-P-L
                   P-L-L

Ambiguous question however.
« Last Edit: June 06, 2010, 05:53:21 pm by Martoman »
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chansthename

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Re: TSSM 2010 MC Q19
« Reply #2 on: June 06, 2010, 04:58:38 pm »
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lol, how many people have done a tssm paper (ans: not many)

I might do it in a few hours just to see what all the fuss (or lack thereof) is about.

I think you should post the question so that people who haven't done it can help too.
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Martoman

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Re: TSSM 2010 MC Q19
« Reply #3 on: June 06, 2010, 04:59:36 pm »
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Question 19
A sample of leucine is added to proline and heated. A series of peptide molecules are formed from
the reaction. 
The number of different dipeptide molecules possible in the mixture is?

Now since its a sample of leucine you can say that there is multiple L's which is why they are right.
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ghadz7

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Re: TSSM 2010 MC Q19
« Reply #4 on: June 06, 2010, 05:12:16 pm »
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Leu - Pro
Leu - Leu
Pro - Leu
Pro - Pro

Where did L L L come from? 'Dipeptide' means only two combinations :s
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m@tty

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Re: TSSM 2010 MC Q19
« Reply #5 on: June 06, 2010, 05:50:37 pm »
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I think she got a bit confused...
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Martoman

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Re: TSSM 2010 MC Q19
« Reply #6 on: June 06, 2010, 05:53:04 pm »
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LOLS i did.

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chansthename

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Re: TSSM 2010 MC Q19
« Reply #7 on: June 06, 2010, 08:19:00 pm »
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Just did this paper, not sure where the bad reputation comes from. it was pretty good. on the easy side but really felt good doing the paper.
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stonecold

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Re: TSSM 2010 MC Q19
« Reply #8 on: June 06, 2010, 08:24:51 pm »
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Does factorial of the number of amino acids give the number of different combinations?
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Martoman

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Re: TSSM 2010 MC Q19
« Reply #9 on: June 06, 2010, 08:26:11 pm »
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Sure does I posted this somewhere.
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naved_s9994

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Re: TSSM 2010 MC Q19
« Reply #10 on: June 06, 2010, 08:30:23 pm »
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Quote from: Martoman on June 06, 2010, 08:26:11 pm
Sure does I posted this somewhere.


Are you sure...?

So if 4 aminos together,  24 combination????
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m@tty

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Re: TSSM 2010 MC Q19
« Reply #11 on: June 06, 2010, 08:32:56 pm »
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Except in cases like this, where you can have the same amino acid bonding together. In this case you use .

This only works when you are finding di-peptides, I am fairly sure.

EDIT:
Quote from: naved_s9994 on June 06, 2010, 08:30:23 pm
Quote from: Martoman on June 06, 2010, 08:26:11 pm
Sure does I posted this somewhere.


Are you sure...?

So if 4 aminos together,  24 combination????

4 different amino acids will have

abcd
abdc
acbd
acdb
adbc
adcb
bacd
..
..
..


EDIT: I've just had a mental blank, I'm not sure about any of this...
« Last Edit: June 06, 2010, 08:42:30 pm by m@tty »
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stonecold

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Re: TSSM 2010 MC Q19
« Reply #12 on: June 06, 2010, 08:34:35 pm »
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Is 'n' the number of DIFFERENT amino acids?
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naved_s9994

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Re: TSSM 2010 MC Q19
« Reply #13 on: June 06, 2010, 08:34:45 pm »
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Quote from: m@tty on June 06, 2010, 08:32:56 pm
Except in cases like this, where you can have the same amino acid bonding together. In this case you use n2=22 = 4.

I see, thanks m@tty :)
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naved_s9994

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Re: TSSM 2010 MC Q19
« Reply #14 on: June 06, 2010, 08:35:06 pm »
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Quote from: stonecold on June 06, 2010, 08:34:35 pm
Is 'n' the number of DIFFERENT amino acids?

Same.. in n^2

For different, u use n factorial
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