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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.
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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. 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






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






3. Failure of chromosome pairs to separate during meiosis






4. Operon 1/2 - gene 1/6






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






6. Gene duplication






7. Vitamin B7 - cofactor that aids in CO2 transfer (carboxylase)






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






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






10. Serine protease that cleaves on c terminal side of aromatics






11. Possess F factor as a plasmid independent of the bacterial genome. The F plasmid contains only F factor DNA and no DNA from the bacterial genome.






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






13. Actin - myosin - and other muscle proteins






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






15. Dynins and kinesins (movement) - cilia and flagella






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






17. Phe - Trp - Tyr - Gly - Pro






18. Ser - Cys - Thr - Gln - Asn






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






20. Do not contain F factor






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






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






23. Can serve as a primer

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






25. An enzyme that removes a phosphate group from its substrate






26. PKa = pH






27. Krebs cycle enzyme






28. Vitamin B1 - cofactor that aids in dehydrogenase mostly






29. Cleaves on C terminal side of lysine and arginine






30. Tightly packed form of DNA - less accessible to protein factors that usually bind DNA






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






32. RNA protein-complex






33. Phosphotransferase - is a type of enzyme that transfers phosphate groups from high-energy donor molecules - such as ATP -[2] to specific substrates. The process is referred to as phosphorylation -






34. Triglycerides - cholesterols - and phospholipids






35. Isoelectric point and MW






36. Gene has multiple effects






37. 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.






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






39. Enzymes in Krebs cycle that produce NADH






40. MRNA






41. Irreversible reaction that require ATP first part of glycolosis






42. Circular and double stranded






43. FAD-2 - NADP-3






44. 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.






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






46. 1e-14






47. Enter cells freely






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






49. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






50. Measures physical base pair distance







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