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Categories Archives: Biochemistry

MCAT Biology Podcast

  • March 22, 2010
  • dmw0619
  • Biochemistry, MCAT MP3's, Pre-Med Podcast

Episode 20: Welcome to the MCAT Podcast series, where Doctor Dan will cover the actual science material required for the MCAT. Starting off with an overview of Biological Sciences topics, we’ll get increasingly more specific as time passes. [display... read more

Vitamin Functions in Humans and Disease

  • January 10, 2009
  • dmw0619
  • Biochemistry

    Aliases Solubility Working Form Functions Deficiency Toxicity Vit A Carotene, Retinol Fat cis-retinol, trans-retinol, retinoic acid, carotene Vision, transcription regulation, antioxidant Vision problems, oxidative damage Yes (retinol); No (carotene... read more

Human Enzyme Chart, by Medical Students

  • January 9, 2009
  • dmw0619
  • Biochemistry

  Enzymes Subject to Phosphorylation   Ca++ and cAMP are intracellular 2nd messengers that respond to hormones binding cell surface receptors When adenylate cyclase is stimulated, intracellular cAMP levels are elevated (made from ATP)   All protein pho... read more

Human Enzymes’ Function

  • January 9, 2009
  • dmw0619
  • Biochemistry

HYDROLASES:  CLEAVES MOLECULES USING HYDROLYSIS   Esterases: a hydrolase that hydrolyzes an ester into its components: an alcohol & an acid.   Acetycholine esterase [nerve gas blocks] Phosphodiesterase 93,104, Cholesterol esterase 30   Lipases: a ... read more

Cellular Transport: Mechanisms and Quick Facts

  • January 8, 2009
  • dmw0619
  • Biochemistry

Transport Mechanisms   Ca++ efflux from ventricular myocardial cells during diastole – secondary active (Na+ coupled)   Ca++ uptake by sarcoplasmic reticulum – primary active   Ca++ uptake by terminal varicosities of sympathetic nerve endin... read more

Biochemical Mechanisms of Common Diseases

  • January 8, 2009
  • dmw0619
  • Biochemistry

Sickle Cell Anemia (Hb S disease)  – Results when a  glutamate is replaced by  valine at position 6 of the b globin chain.  Symptoms include anoxia, poor circulation, and crises when variables that lower oxygen affinity (i.e. ­BPG, ¯pH, etc) a... read more

Amino acids, DNA and Cholesterol

  • January 8, 2009
  • dmw0619
  • Biochemistry

  Essential Amino Acids Lys, ISO, LEU, THR, VAL, TRY, PHE, MET, HIS, ARG Required in diet; no exception “Little TV Tonight (PM) – HA”   Nonessentials Serine → Gly or Cys (from Homocysteine + Ser) Glutamate → Gln, Pro, Arg     Â... read more

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