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






2. Measures physical base pair distance






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






4. Irreversible reaction that require ATP first part of glycolosis






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






6. Failure of chromosome pairs to separate during meiosis






7. 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 -






8. Derived from golgi vesicles






9. Val - Leu - Ile - Ala - Met






10. Makes Acetyl-CoA from pyruvate






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






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






13. Ser - Cys - Thr - Gln - Asn






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






15. Only one carbon center is changed






16. 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






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






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






19. 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.






20. 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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21. RNA protein-complex






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






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






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. 1e-14






26. Circular and double stranded






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






28. Krebs cycle enzyme






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






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






31. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






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






33. Isoelectric point and MW






34. Actin - myosin - and other muscle proteins






35. Do not contain F factor






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






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






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






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






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






41. 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.






42. 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.






43. Phe - Trp - Tyr - Gly - Pro






44. PKa = pH






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






46. Can serve as a primer

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






48. 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






49. Repeated replication w/o cell division






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