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  1. USMLE Step 1 Forum
    I can't figure it out, why to supplement hyperpigmented people with vitD if they are breast feeding ?? Is there some physio between prolactin n melanin?
  2. USMLE Step 1 Forum
    Which of these substrates can be used immediately for substrate level phosphoryation to produce ATP or an equivalent a) 3-Phosphoglycerate b) Pyruvate c) Glyceraldehyde d) Phosphoenolpyruvate e) Succinate
  3. USMLE Step 1 Forum
    During exercise body needs more energy which is only possible if citric cycle and oxidative phosphorylation increases BUT they actually inhibited due to increase NADH..and pyruvate converted to lactate ..WHY???? does lactate produce more energy ??if yes how?
  4. USMLE Step 1 Forum
    I have asked a similar question but now I face the dilemma! No matter what, I read First aid but I am between reading lippincott's biochemistry( only chapters associated with first aid material) or watch kaplan lectures once and read first aid. please share your experience! thank you!
  5. USMLE Step 1 Forum
    Regarding The Krebs Cycle (TCA) in the first aid 2012 , they mention it produces 12 ATP/Acetyl Co-A , First Aid 2012 Errata make a correction that it produces only 10 ATP ???! While Kaplan Still stick to the idea it make 12 ATP ???!111 :confused::confused:
  6. USMLE Step 1 Forum
    what does rate limiting enzyme even mean or signify? jw
  7. USMLE Step 1 Forum
    How can we differentiate that accumulation of lactose is due to BETA GLYCOSIDASE or GAL 1P URIDYLTRANSFERASE ? UW gives same symptoms..
  8. USMLE Step 1 Forum
    I am new medical graduate. I have started my preparation for step1 and I am pretty confused about biochemistry. I have decided to learn it that way; - use first aid 2013 as a guide and read what is included from Lippincott's biochemistry too (only related chapters not the whole book). - learn...
  9. USMLE Step 1 Forum
    ALA synthase increase in Alcohol but decrease in excess of glucose...plz explain
  10. USMLE Step 1 Forum
    Can anyone plz solve Gibbs equation to find equilibrium constant. Only thing given is delta G=400kcal equation is delta G=-RTInKeq
  11. USMLE Step 1 Forum
    Hello guys hope ur all doing well... I have a friend who took step 1 last week he said he got a lot of biochem in his questions and mostly they were genetic/biochem experiments about DNA and several enzymes... My question is how can I prepare for such questions ? I asked my friend if he could...
  12. USMLE Step 1 Forum
    Hello everyone!:D This is my first message. I am an IMG starting my preparation for Step 1. This site is really helpful. Anyway, I was reading anemias and specifically sideroblastic anemia. Could someone please clarify the exact mechanism by which INH causes B6 deficiency and therefore...
  13. USMLE Step 1 Forum
    Hi, I'm studying amino acids now and I found in Kaplan that Methionine has uncharged polar side chain while tryosine is non-polar hydrophobic, then I saw it reversed in Lipincott, which one I should believe now ??!!
  14. USMLE Step 1 Forum
    I'm confused about a note on FA about Ehler's Danlos syndrome, it states " type 1 or type 5 collagen most frequently affected in severe classic Ehler's Danlos syndrome" on the errata doc it states change it to " it might be confused with Marfan syndrome" I thought collagen type III is...
  15. USMLE Step 1 Forum
    Will start biochem from Monday ... Any suggestions Regards how to read bio and all ?? Can it be done in 15 days ?? With 6 hours of study time?? Do I need to memorize all the pathways ?? Behavioral can it be done parellelly while reading bio .. Is it good ??
  16. USMLE Step 1 Forum
    in glycogen storage type one disease , von gierke disease , it is stated that sucrose and galactose wont increase the glucose level , anyone got an explanation for this ? thanks
  17. USMLE Step 1 Forum
    im having a very hard time remembering biochemistry..:o please help..:confused:
  18. USMLE Step 1 Forum
    Dear Friends, I have completed my first read with kaplan LN for all the subjects except for pathology..i am planning to start FA with UW, my exam date on December..should i read kaplan LN for Biochemistry and for immunology, or shall i stick with FA with UW for all the subjects because when i...
  19. USMLE Step 1 Forum
    Which one of these Amino acids ( Met or Tyr ) fits into the hydrophilic category? The Kaplan LN and the Lippincott's book contradict each other!:confused:
  20. USMLE Step 1 Forum
    why normal PTH in hypoalbuminemia? I think PTH should be decreased because low albumin levels attach less calcium so more free calcium is present which should decrease PTH. SOURCE:goljan 3rd ed. pg 493(diagram 22-15)
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