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






2. Isoelectric point and MW






3. RNA protein-complex






4. Derived from golgi vesicles






5. Triglycerides - cholesterols - and phospholipids






6. FAD-2 - NADP-3






7. 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.






8. 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.






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






10. 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






11. Actin - myosin - and other muscle proteins






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






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






14. Val - Leu - Ile - Ala - Met






15. 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 -






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






17. Measures physical base pair distance






18. Cleaves on C terminal side of lysine and arginine






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






20. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






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






22. Catalyzes the transport of tRNA and mRNA down the ribosome in prokaryotes






23. Only one carbon center is changed






24. 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






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






26. Enter cells freely






27. Failure of chromosome pairs to separate during meiosis






28. Krebs cycle enzyme






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






30. 1e-14






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






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






33. Irreversible reaction that require ATP first part of glycolosis






34. Operon 1/2 - gene 1/6






35. Circular and double stranded






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






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






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






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






40. Repeated replication w/o cell division






41. Gene has multiple effects






42. Ser - Cys - Thr - Gln - Asn






43. 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.






44. PKa = pH






45. Enzymes in Krebs cycle that produce NADH






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






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






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






49. 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






50. Do not contain F factor