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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. Circular and double stranded






2. Ser - Cys - Thr - Gln - Asn






3. Can serve as a primer


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






5. Gene has multiple effects






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






7. Do not contain F factor






8. 1e-14






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






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






11. Measures physical base pair distance






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






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






14. 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.






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






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. RNA protein-complex






18. Isoelectric point and MW






19. Vitamin B1 - cofactor that aids in dehydrogenase mostly






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






21. Makes Acetyl-CoA from pyruvate






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


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






24. Only one carbon center is changed






25. 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 -






26. Repeated replication w/o cell division






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






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






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. Derived from golgi vesicles






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






32. Neutralizes H2O2 - found in lysosomes






33. Can undergo both lytic and lysogenic cycle






34. Failure of chromosome pairs to separate during meiosis






35. Phe - Trp - Tyr - Gly - Pro






36. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






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






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






39. PKa = pH






40. 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.






41. Actin - myosin - and other muscle proteins






42. Cleaves on C terminal side of lysine and arginine






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






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






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






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






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






48. 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.






49. Krebs cycle enzyme






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