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GRE Biochemistry

Subjects : gre, science
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • 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. Tightly packed form of DNA - less accessible to protein factors that usually bind DNA






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






3. 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






4. Vitamin B1 - cofactor that aids in dehydrogenase mostly






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






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






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






8. 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.






9. Secondary messenger - used for intracellular signal transduction - such as transferring the effects of hormones like glucagon and adrenaline - which cannot pass through the cell membrane. It is involved in the activation of protein kinases and regula






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






11. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






12. Enter cells freely






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






14. Failure of chromosome pairs to separate during meiosis






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






17. RNA protein-complex






18. 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






19. MRNA






20. Actin - myosin - and other muscle proteins






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






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






23. Enzymes in Krebs cycle that produce NADH






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. Do not contain F factor






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






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






28. Makes Acetyl-CoA from pyruvate






29. Triglycerides - cholesterols - and phospholipids






30. Repeated replication w/o cell division






31. Gene duplication






32. Val - Leu - Ile - Ala - Met






33. Measure tendency for recombination (frequency) 1cM = 1% chance of being separated






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






35. Only one carbon center is changed






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






37. Irreversible reaction that require ATP first part of glycolosis






38. Gene has multiple effects






39. Ser - Cys - Thr - Gln - Asn






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






41. Neutralizes H2O2 - found in lysosomes






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






43. Phe - Trp - Tyr - Gly - Pro






44. Circular and double stranded






45. Cleaves on C terminal side of lysine and arginine






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






47. Krebs cycle enzyme






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






49. Measures physical base pair distance






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