anonymous
  • anonymous
@Frostbite Explain here!
Biology
  • Stacey Warren - Expert brainly.com
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
I'm closing this question! but you explain me here!
Frostbite
  • Frostbite
Right. But try do the little hand experiment. The palms have to face the same direction btw!
anonymous
  • anonymous
I'm trying haha

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Frostbite
  • Frostbite
Can you make them overlap? ;)
anonymous
  • anonymous
I think I didn't get! What I have to do? :o
Frostbite
  • Frostbite
Take one hand and place the other in top of it. Does the hands overlap or is there some kind of problem? ;)
anonymous
  • anonymous
Haha I did! Now I'm typing.. What this experiment is supposed to be? 2 forms of glucose is equivalent to left and right in common terms.?
Frostbite
  • Frostbite
Exactly. What i wanted you to try find out is that your hands are mirror images of each other... and guess what... the same thing goes for molecules! :)
anonymous
  • anonymous
Those two forms of glucose are?
anonymous
  • anonymous
Cellulose and starch right?
Frostbite
  • Frostbite
We call one alpha \(\alpha\) and the other one beta \(\beta\). The difference is like in your hands that there are a mirror image. The mirror image does so different bonds are created, and you may have guessed it, our enzymes (in a human) can only catalyze one of the mirror image, while for example a cow that can eat grass and starch can catalyze both. we therefor say: Alpha-glucose is in starch. Beta-glucose is in cellulose. This is somehow understandable?
anonymous
  • anonymous
Yes! I got it now! I think.....
Frostbite
  • Frostbite
A little example of this using two molecules (not glucose, but just two molecules): |dw:1377729874086:dw|
Frostbite
  • Frostbite
They are NOT identical.
anonymous
  • anonymous
Review ! what the question was! :/
Frostbite
  • Frostbite
A little example of the importance of this: A drug called Thalidomide was ones given to pregnant women. This was BEFORE we know about mirror images in molecules... while one of the mirror image killed the plain, the women had, the other mirror image, did so the child became malformed malformed. http://1.bp.blogspot.com/_DW_dyBBaOTQ/ShxgsuTYHdI/AAAAAAAAEAQ/oQiZJqitqsM/s400/thalidomide-baby.jpg
Frostbite
  • Frostbite
killed the pain*
Frostbite
  • Frostbite
So a review of your question: Cellulose and starch are BOTH made from glucose, but glucose can take two forms we call alpha and beta that ensure cellulose and starch become different. We can see this in our self as we can digest starch, but not cellulose
anonymous
  • anonymous
Got it.....
Frostbite
  • Frostbite
Perfect :)
Frostbite
  • Frostbite
|dw:1377730791540:dw|
anonymous
  • anonymous
Medal for frostbite :D
Frostbite
  • Frostbite
Thank you very much. So now I have a little task for you!
Frostbite
  • Frostbite
To see if you understand it.
anonymous
  • anonymous
Noooooo !
anonymous
  • anonymous
Haha okay ask!
Frostbite
  • Frostbite
The structure of D-glucose (we get back to why it is called D-glucose) that create a ring can be summarized by the following drawing: |dw:1377731023411:dw| The drawing you see is for alpha-D-glucose. Using the knowledge from before, I want you to draw beta-D-glucose.
anonymous
  • anonymous
This is difficult >.>
Frostbite
  • Frostbite
Use the drawing on this form: |dw:1377731254934:dw| Write what should be on the sticks. (the one pointing up and down)
Frostbite
  • Frostbite
And it is not that hard just remember it most be it's mirror image! :)
anonymous
  • anonymous
|dw:1377731417425:dw| There should be H and OH right? You said mirrior image? T__T
anonymous
  • anonymous
I don't know now :/
Frostbite
  • Frostbite
No need to worry. The one you drew is the same I drew, in order to make it the mirror image, we simply put OH where H was and H were OH was. So we get: |dw:1377731656317:dw|
anonymous
  • anonymous
Mirror images means both are opposite lol I got it now! I did the same for alpha and beta :P
anonymous
  • anonymous
There is no option to give another medal!damn! Thanks @Frostbite
Frostbite
  • Frostbite
No problem, I hope it was able to understand. When we are going to talk about the structure of glucose we get to extend what you have learned now.
anonymous
  • anonymous
Hmm! I need to practice then!
Frostbite
  • Frostbite
I'm gonna give you a homemade example! :D
anonymous
  • anonymous
Homemade example means?
Frostbite
  • Frostbite
meaning that I've just created it in this very sec.
anonymous
  • anonymous
Let me see that homemade example!
Frostbite
  • Frostbite
Are the two molecules in the picture below identical? http://oi44.tinypic.com/3449hzn.jpg
anonymous
  • anonymous
Yes
anonymous
  • anonymous
I was going to say that
anonymous
  • anonymous
Because that other molecule has turned on other side! ?:P
Frostbite
  • Frostbite
Right. So the two molecules... can they overlap? :)
anonymous
  • anonymous
Yes!
anonymous
  • anonymous
They can overlap because they're like mirror images as you said :/ I'm wrong? I think idk
Frostbite
  • Frostbite
Your hands are mirror images of each other, they can therefor not overlap. So I ask again: can the molecules in the picture overlap?
anonymous
  • anonymous
No!
Frostbite
  • Frostbite
Exactly! So now that lead me to a very important conclusion for this picture. For a ball (black) whereto 4 different balls are connected (purple, blue, brown and red) there are always 2 different versions! Now, what atom can make four bonds and is very much used in organic chemistry / biochemistry... I think you guessed it -> Carbon (C) if there is a C with 4 different groups to it, then there exist two versions of the molecule.
anonymous
  • anonymous
My step mommy will come at anytime and kill me >.< I gotta go! When you'll be back again?
Frostbite
  • Frostbite
And this concludes what I'm going to teach you today. Go think a bit about it and we talk about this tomorrow.
anonymous
  • anonymous
Okay!
Frostbite
  • Frostbite
See ya and it has been fun :)
anonymous
  • anonymous
Ya You're an awesome Tutor!
Frostbite
  • Frostbite
The following picture is the structure of D-glucose. |dw:1377815797415:dw| How many asymmetrical carbon atoms are there in the molecule (A carbon surrounded by different groups) Use try drawing and mark them with a circle.
Frostbite
  • Frostbite
A carbon surrounded by 4 different groups*
Frostbite
  • Frostbite
Remember our discussion about the picture.
Frostbite
  • Frostbite
|dw:1377816177292:dw|
anonymous
  • anonymous
You drew it already?
Frostbite
  • Frostbite
not necessarily
Frostbite
  • Frostbite
But try put a circle around the C atoms surrounded by 4 different groups.
anonymous
  • anonymous
I couldn't get :/
anonymous
  • anonymous
You mean I have to circle those 4 carbon atoms?
Frostbite
  • Frostbite
Maybe, trust your self :)
anonymous
  • anonymous
|dw:1377816649548:dw| Like this? :O
Frostbite
  • Frostbite
Exactly!!! Damn your good. Can you then say how many forms there are of the sugar?
anonymous
  • anonymous
5? ://
Frostbite
  • Frostbite
Not quite.
anonymous
  • anonymous
Are you asking about those alpha and beta glucose? :I
Frostbite
  • Frostbite
No I just ask how many different structure can be made, but have the same molecular composition (the same atoms)
anonymous
  • anonymous
4? right? :I
Frostbite
  • Frostbite
Many more :) \(2^{4}\) How many is that? :)
anonymous
  • anonymous
I'm not getting! Explain me
Frostbite
  • Frostbite
Try look at this drawing (bottom row) http://www.science.fau.edu/chemistry/mari/biochemlab/10_001.jpg You see there are 8 forms, but there are also equally many L forms.
anonymous
  • anonymous
:c
Frostbite
  • Frostbite
You don't see it? Well I will not ask you to draw all 16 in order to convince your self, that is just a waist of time, but if you did you'll see there are 16 different.
anonymous
  • anonymous
Hmm..I saw that.. Got it ..
Frostbite
  • Frostbite
Perfect :)

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