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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. Phe - Trp - Tyr - Gly - Pro






2. 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.






3. Enzymes in Krebs cycle that produce NADH






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






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






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






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






8. Gene has multiple effects






9. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






10. Actin - myosin - and other muscle proteins






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






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






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






14. Donates electrons to form a bond such as N in amines and O in alcohols






15. 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.






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






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






18. 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






19. Irreversible reaction that require ATP first part of glycolosis






20. Val - Leu - Ile - Ala - Met






21. Circular and double stranded






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






23. 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 -






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






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






26. 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.






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






28. FAD-2 - NADP-3






29. Gprotein association - exchanges GDP to GTP - converts AMP into cyclic AMP. Cyclic AMP binds to protein kinase A: Protein kinase A phosphorylates phosphorylase kinase. increases Ca which binds calmodulin proteins which then binds to phosphorylase kin






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






31. Measures physical base pair distance






32. Isoelectric point and MW






33. RNA protein-complex






34. Gene duplication






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

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36. Cleaves on C terminal side of lysine and arginine






37. Enter cells freely






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






39. Vitamin B1 - cofactor that aids in dehydrogenase mostly






40. 1e-14






41. PKa = pH






42. Derived from golgi vesicles






43. Do not contain F factor






44. Can serve as a primer

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45. Repeated replication w/o cell division






46. Failure of chromosome pairs to separate during meiosis






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






48. Ser - Cys - Thr - Gln - Asn






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






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






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