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GRE Biochemistry

Subjects : gre, science
Instructions:
  • Answer 50 questions in 15 minutes.
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  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. FAD-2 - NADP-3






2. Irreversible reaction that require ATP first part of glycolosis






3. Cleaves on C terminal side of lysine and arginine






4. Cis faces the ER and trans faces the plasma membrane






5. Actin - myosin - and other muscle proteins






6. It uncouples oxidative phosphorylation by carrying protons across the mitochondrial membrane - leading to a rapid consumption of energy without generation of ATP.






7. Catalyzes the irreversible carboxylation of pyruvate to oxaloacetate (OAA).






8. Derived from golgi vesicles






9. Makes Acetyl-CoA from pyruvate






10. Nuclear lamins - desmins - keratins - internexins (structure)






11. Acetyl-CoA to malonyl-CoA - rate limiting step in fatty acid synthesis






12. Unwound - participates in the active transcription of DNA to mRNA products - site of RNA Pol II regulation






13. Isoelectric point and MW






14. Only one carbon center is changed






15. Secondary messenger - used for intracellular signal transduction - such as transferring the effects of hormones like glucagon and adrenaline - which cannot pass through the cell membrane. It is involved in the activation of protein kinases and regula






16. = pKa+ log(B/A) - -log(Ka)






17. Enzymes in Krebs cycle that produce NADH






18. PKa = pH






19. Can serve as a primer


20. Krebs cycle enzyme






21. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






22. Triglycerides - cholesterols - and phospholipids






23. Contain their own DNA - mRNA - and proteins to synthesize more






24. Vitamin B1 - cofactor that aids in dehydrogenase mostly






25. Gene duplication






26. The most important regulatory enzyme of glycolysis. It is an allosteric enzyme made of 4 subunits and controlled by many activators and inhibitors. PFK-1 catalyzes the important 'committed' step of glycolysis - the conversion of fructose 6-phosphate






27. Phe - Trp - Tyr - Gly - Pro






28. Regulator of glycolysis when glucose is low by cleaving 2;6 BPG lowering PFK1 - opposite effect when glucose is high






29. Ser - Cys - Thr - Gln - Asn






30. Catalyzes the transport of tRNA and mRNA down the ribosome in eukaryotes






31. Possess an F plasmid that also includes some DNA taken from the bacterial genome. Sometimes it is formed by incorrect excision from the chromosome


32. Measure tendency for recombination (frequency) 1cM = 1% chance of being separated






33. Preferable to hydrolysis (like in the breakdown of glycogen or starch - as in the example above) because glucose 1-phosphate yields more ATP than does free glucose when subsequently catabolized to pyruvate.






34. Acts as a coenzyme in all transamination reactions - and in some decarboxylation and deamination reactions of amino acids. The aldehyde group of PLP forms a Schiff-base linkage (internal aldimine) with the e-amino group of a specific lysine group of






35. Val - Leu - Ile - Ala - Met






36. When exons are arranged in multiple orders after removal of introns






37. Recruits RecA protein - inhibited by LexA - results in mutagenesis






38. Non-protein chemical compound that is bound to a protein and is required for the protein'S biological activity






39. (His - Arg - Lys +) - (Glu - Asp -)






40. Repeated replication w/o cell division






41. Neutralizes H2O2 - found in lysosomes






42. Enter cells freely






43. Catalyzes the addition of bicarbonate to phosphoenolpyruvate (PEP) to form the four-carbon compound oxaloacetate






44. RNA protein-complex






45. Measures physical base pair distance






46. Possess F factor integrated into the bacterial genome. After integration into the host chromosomal DNA - these plasmids possess portions of - or entire - F factor and portions of the bacterial genome.






47. Recognizes and targets specific proteins to the endoplasmic reticulum in eukaryotes and the plasma membrane in prokaryotes






48. 1e-14






49. Catalyze the phosphorylation of tyrosine residues in proteins - involved in signal cascades






50. Can result in allele differences - suce as 3:1 and 1:3