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Kaplan Qbank USMLE



Author6 Posts
  #1

How many ATP's are produced from:

1- Piruvate to acetylCoA
2-Glucose to CO2+H2O
3-Glucose to piruvate
4-Glucose to alanine
5-Palmitate to ammonia+CO2

  #2

can we start with how many ATPs in play in all the major cycles...glycolysis, glycogenolysis, gluconeogenesis, etc...


  #3

this is really wierd topic to me....can anyone explain it...ALL

___________________
Live as u were to die tommorow. Learn as if u were to live forever.

  #4

i would say :

1-3ATPs

2-38 ATPs

3-8 ATPs

4-8 (?) ATPs

1.Py------->Acetyl CoA : NADH is realeased=>3 ATP (the elecron transport chain -->for a NADH u have 3ATPs and for a FADH2 u have 2ATPs)

2.Glucose---->CO2 + H2O (this is aerobic glycolisis + TCA cycle i woud say...am i wrong? maybe i'm wrong guys so correct me if i'm wrong...)

from aerobic glycolisis :for 1 Glucose--->2 Py + 2ATP + 2NADH = 2Py + 8ATP

from TCA (from 1py--->AcetylCoA :3ATP

from 1Acetyl CoA --->2*CO2 + 3 NADH + FADH2 + GTP = 9 + 2 + 1 =12ATP. 12+3=15ATP (from one Py that enters TCA) but i think we have to double , because we have 2Py from glycolisis.=>30 ATP. Finnaly 30 + 8ATP=38 . is this the final answer?

3. Glucose---->Py (aerobic glycolisis) :2ATP + 2NADH =2 ATP + 2*3=8 ATP

4.Glucose------>Ala (first Glucose---->Py : 8ATP) then Py----->Ala (catalyzed by Ala aminotransferase , but i have no idea if it's used or realeased energy) so 8 is the final answer?

5.Palmitate ------>NH4 + CO2 (fatty acid lysis) i have NO IDEA....

can u please tell me the right answers/?

L.




  #5

how can u get ammonia from palmitate?




  #6

ok the post is from 24 feb 2004 , i guess i could die waiting for an answer hahahhahahahhaha

grin








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