Determine the number of net ATPs produced in the following situations. Assume th
ID: 3519488 • Letter: D
Question
Determine the number of net ATPs produced in the following
situations. Assume that each NADH and FADH2 enter the STE. Be careful, sometimes not
is ATP what you want to determine
Show your calculations and strategies to get the corresponding number
_______________6. Six fumarate molecules enter Krebs.
_______________7. The cell is grown in three molecules of oxaloacetic acid.
_______________8. The cell is grown is two maltose molecules and is added
enzyme fructase.
_______________9. Number of ATP by oxidative phosphorylation if two are metabolized
glucose molecules in the absence of oxygen.
_______________10. ATP number by phosphorylation at the substrate level if
metabolize two molecules of glucose in the presence of oxygen.
Explanation / Answer
6) six fumarate molecules enters kreb cycle-
It changes to L-malate by enzyme fumarase.With help of water hydration of C-C bond occurs.
There is no specific production of ATP,NADH or FADH2 in this step.
7) cell is grown in three molecules of oxaloacetic acid-
HeRe also,by enzyme citrate synthase oxaloacetic acid is converted to citrate that is 4C compound converted to 6C compound with hydration.
There is no specific production of ATP in these steps.
8)The cell is grown in maltose medium.we know that maltose breaks down itno two glucose units by enzyme maltase.Enzyme fructase will not act on this disaccharide due to which there will be no glucose produced and hence no ATP.
It there would have been maltose it will produce 4 glucose molecules from 2 maltose.Also there can be conversion from glucose to fructose which will again produce net 8 ATP at substrate level.
9) Number of ATP produced in absence of oxygen is called fermentation.
2 Net ATPs are produced from 1 glucose molecule.
Total number of ATP produced are- 4 ATP
No net NADH is produced as it is utilised in the process of fermentation.
10) 2 ATP are produced at substrate level from 1 glucose molecule.
That means from 2 glucose molecules total 4 ATPs will be produced.
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