The "Point" of cellular respiration

[biology_06er]

Hi

Is the whole point of cellular respiration to make ATP as WELL as oxygen? Also does NADH carry 2 electrons and FADH2 carry 1 electron-during the electron transport chain??
last questions (i hope)

the following type of enzyme is used in ox’dn/rd’n reactions

-kinase
-none are involved in oxidation/reduction reactions
-isomerase
-phosphatase
-dehydrogenase

umm i thought all of them would be…thinking of glycolysis (thats a ox/rd reaction right????)..they are all used such as hexokinase, triose phosphate dehydrogenase, isomerase (for dihydroxyacetone phophate/glyceraldehyde 3-phosphate)…also say for example i talk about hexokinase that is a kinase right cos it transfers a Phosphate group from ATP to form glucose-6-phoshate and then pyruvate kinase why is it called a kinase when it takes a phosphate group away from phosphoenolpyruvate

why maximal rates of ATP production are different for different fuel sources?…eeek I cannot find any info. in my notes only the order it goes down in…eg: muscle atp…creatine phosphate…muscle glycogen to lactate etc etc…but how to explain this…anyhelp would by much appreciated…I have a exam on sat. and im freaking out!!! 😯

[Poison]

Point of cellular respiration is to produce ATP. With or without O2. If O2 is used more ATP is optained.

Every compound used as fuel, has its own entrance step to cellular respiration process, therefore you get different numbers of ATP.

[biology_06er]

Hi

Thanks for reply…But what do you mean entrance step? 😳

[Poison]

Some molecules enter the reaction from the beginning, some enter from Krebs and so on.

[biology_06er]

oh ok i get that but i am talking about muscle ATP, creatine phosphate, muscle glycogen to C02, muscle glycogen to lactate, fatty adipose tissue? like how come all those yield different amounts of ATP? or is it the same principle?

[Poison]

They have different mechanisms for ATP production. What I was trying to say is that some can convert toeach other or some can enter the normal glucose reaction from a step and continue the reaction.

[Author]

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