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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. An enzyme that removes a phosphate group from its substrate






2. Phe - Trp - Tyr - Gly - Pro






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






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






5. Can undergo both lytic and lysogenic cycle






6. 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.






7. 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






8. Circular and double stranded






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






10. 1e-14






11. Cleaves on C terminal side of lysine and arginine






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






13. Krebs cycle enzyme






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






15. Gene duplication






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






17. Do not contain F factor






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






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






20. PKa = pH






21. FAD-2 - NADP-3






22. Measures physical base pair distance






23. Neutralizes H2O2 - found in lysosomes






24. Failure of chromosome pairs to separate during meiosis






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






26. 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.






27. RNA protein-complex






28. Isoelectric point and MW






29. Triglycerides - cholesterols - and phospholipids






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






31. Enter cells freely






32. 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






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






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






35. Derived from golgi vesicles






36. Irreversible reaction that require ATP first part of glycolosis






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






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






39. Vitamin B1 - cofactor that aids in dehydrogenase mostly






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






41. Repeated replication w/o cell division






42. Can serve as a primer

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






44. 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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45. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






46. Actin - myosin - and other muscle proteins






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






48. Enzymes in Krebs cycle that produce NADH






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