A2 - Respiration - start to finish

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200 points - summarise the respiration process that sees the break down of one molecule of glucose in Aerobic conditions. Include coenzymes and by-product formation.

I was going to do it like we do in class. Lets try this way first.

Posted: 29-11-09 21:25 by Mike McNicholas


Okay I'll go first.

Glycolysis is the process (haha that rhymed) in which glucose is broken down into two molecules of pyruvate. It occurs in the cytoplasm of the cell and is an anaerobic process. The glucose undergoes two phosphorylation reactions which splits it into two triose-phosphate molecules. These are then converted into pyruvate. The net yeild for this reaction is 2ATP, 2 H20, 2 pyruvate, and 2 NADH and H+.

Posted: 29-11-09 21:59 by Lauren Carry

I challenge you to produce the respiration rap! Carry - what is a yeild? Is it something Penelope Pitstop might say? Oh no, sorry ... yield. I before E ... yahdeyah ;)

Posted: 29-11-09 22:09 by Mike McNicholas

Awhhh in my defence for the "yield" error I was extremely hungover!! And LOL at the ostrich. I'm laughing too much to caption.

Posted: 30-11-09 14:21 by Lauren Carry

Haaha! :D Gutted Rob! :P

Posted: 30-11-09 23:41 by Matthew Maguire

I'm gonna take Laurens pyruvate and turn it into Acetyl-CoA, ready for the link reaction. 8) Co-enzyme A is added to the pyruvate to become Acetyl-CoA and that can be imput into the Krebs cycle at last! The pyruvate must under-go de-carboxilation and remove a carbon in the form of carbon dioxide. This step also involved de-hydrogenation as NAD is added and exits this reaction as NAD reduced. This all happens in the Mitochondria.

Posted: 01-12-09 17:17 by Matthew Maguire

acetyl joins up with a 4 carbon molecule to make the 6 carbon citrate, citrate is the oxidised into a 5 carbon NAD is used for this and NADH is given off along with CO2 and ATP, the 5 carbon is the oxidised into a 4 carbon once again NAD is used and NADH is given off along with CO2. the 4 carbon is the aranged into a different 4 carbon and FAD is used for this and that gives of FADH. the arranged for carbon is the re arreanged further and NAD is used and NADH is given off. then the cycle starts all over again.

this happens 2 times per gloucose molecule.
i did draw a diagram and i have witnesses of me doin this but you cant see it

Posted: 02-12-09 14:53 by Robert Austick

oh yh that is called Kreb cycle

Posted: 02-12-09 14:54 by Robert Austick

witness is no other than moi.. but anyway.. after krebs you have oxidative phosphorylation - takes place in the inner membrane of the mitachondria..

urm the protons (H+) are released from NADH and FADH...the H atoms are split into protons and electrons

the electrons move along the electron transport chain.. through 3 carriers.. and they lose energy at each carrier

this energy is used by the electron carriers to pump the protons from the matrix into the intermembrane space

The concentration of the H+ is obviously in the interspace membrane than the matrix... therefore creates a electrochemical gradient (conc. grad)

The H+ move down this gradient back into the matrix via ATP SYNTHASE... this movement drives synthesis of ATP from ADP + Phosphate.

urrm then you've got chemosmosis which is urrm the movement of protons across the membrane which regenerates ATP

In the matrix at the end of the transport chain.. protons.. electrons and oxygen (from the blood) combine to form.. wateeeeer.. urm oxygen said to be the final electron accepter...

erm theres 32 ATP made for every 1 glucose

and i think jobs a gud un..

and Lauren.. i do apologise in advance for any spelling or grammer mistaskes :)

Posted: 02-12-09 20:47 by Banisha Nayyar

lol I see no slang, you did really well Banisha, I'm proud! :D

I like how Will didn't have to do a stage __ PFT

We all kick **** at Respiration man.

Posted: 03-12-09 19:14 by Lauren Carry

Yeah Gutted man, I wish sum1 left me a stage to do. Can anyone think up sumfing for Bigboywill 2 do, itz all about spreading the knoledge people! ;-)

Posted: 03-12-09 21:15 by william

I can. Tell me about Anaerobic respiration and how NADH is recycled (otherwise...)

Posted: 03-12-09 21:50 by Mike McNicholas

What is the total ATP produced per glucose (through aerobic respiration)?

Posted: 03-12-09 21:53 by Mike McNicholas

Will - I want you to moderate the steps checking each statement for factual content. Frame the feedback for each person who contributed before lesson tomorrow.

Posted: 03-12-09 21:57 by Mike McNicholas

MOCK EXAM - date scheduled for next week - the whole unit 4 covered - MONDAY LESSON 1.

Posted: 03-12-09 22:15 by Mike McNicholas

Yey. A mock. On a Monday first thing in the morning. After a party on Saturday. Man I'm going to be one happy bunny :P

Ohhh and btw is it 36 or 38 molecules of ATP per glucose? Or neither? I'm confused. Help!

Posted: 04-12-09 20:19 by Lauren Carry

yeah Lauren its 38 molecules of ATP per Glucose molecule! ;) and yeah im not going to the party(Gabs) got Exam and cant be taking chances lol Infact thats one question answerd for McNic and the second answer for McNic is that NADH reduced is recycled at the Last stage -Oxidative Phosphorylation(ETC) where the Hydrogen is relased and so the NAD then goes bk 2 Glycolysis for further reactions. and Ive checked everyone of them and they re all correct because most of the comments actully are copied nearly word for word from the A2 Revision Guide. ;)

Posted: 05-12-09 17:03 by william

hus answer is copied from th revision guide _ i can asure u mine int

Posted: 06-12-09 17:40 by Robert Austick

Mine wasn't copied either so HA

Posted: 06-12-09 19:01 by Lauren Carry

You know what i think about that revision guide... limited uses ... it is great for a quick dip but really a good set of notes from a good book will beat a ready made revision text.

Posted: 08-12-09 21:32 by Mike McNicholas