Help on a bio question please?!

[Kaka89]

Advertisement - Members don't see this ad

what do muscle cells during oxygen deprivation gain from the conversion of pyruvate?
a. atp and lactate
b. nad+ and lactate
c. CO2 and lactate
d. atp and alcohol
e. atp, lactate and CO2

Thanks a lot guys!!

 

[Predental2012]

I would think it'd be (b) nad+ and lactate because when your muscles don't have enough oxygen, then they'll undergo anaerobic glycolysis of which lactate is the product. And this also regenerates nad+ which is needed to keep going through glycolysis to generate ATP.

 

[Moonie87]

B.

Glycolysis happens and the product is pyruvate.
Since there is no oxygen the muscle doesn't do the citric acid cycle and changes the pyruvate to lactate and NAD+.
The NAD+ is needed to keep glycolysis going, and if I remember right the ATP produced is only during glycolysis, and not when pyruvate is converted to lactate and NAD+.

 

[Kaka89]

Thanks guys.. I thought there was an error in the question but it does make sense since the atp produced is not DIRECTLY due to the anaerobic process!

 

[Teeth12345]

Sorry to revive this thread but I just took that Topscore too and I'm stumped with this one. I think the best answer would be NAD+, lactate, and ATP. Why does the answer only include NAD+ and lactate?
I thought that during glycolysis, 2 ATP are created via substrate-level phosphorylation...

Thanks!

 

[dentalWorks]

Sorry to revive this thread but I just took that Topscore too and I'm stumped with this one. I think the best answer would be NAD+, lactate, and ATP. Why does the answer only include NAD+ and lactate?
I thought that during glycolysis, 2 ATP are created via substrate-level phosphorylation...

Thanks!

True, but what do you need in-order to make those 2 ATPs?

You need NAD+ right? This process of converting pyruvate to lactate regenerates NAD+ so that the initial phases of Glycolysis (like substrate level phosphorylation) can continue.

There is no direct ATP production when you convert pyruvate to lactate

 

[Teeth12345]

oh ok I get it, thanks!...but I still think the wording is kinda tricky...when you're under pressure you might just clump closely associated things together.
But I guess that's why we all LOVE this test so much 😀