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






2. 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.






3. Irreversible reaction that require ATP first part of glycolosis






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






5. Krebs cycle enzyme






6. RNA protein-complex






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






8. 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 -






9. Actin - myosin - and other muscle proteins






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






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






12. Circular and double stranded






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






14. Makes Acetyl-CoA from pyruvate






15. Do not contain F factor






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






17. 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






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






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






20. Derived from golgi vesicles






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


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






23. 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.






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






25. Gene has multiple effects






26. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






27. Enzymes in Krebs cycle that produce NADH






28. Gene duplication






29. Cleaves on C terminal side of lysine and arginine






30. Ser - Cys - Thr - Gln - Asn






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






32. 1e-14






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






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






35. 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.






36. Isoelectric point and MW






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






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






39. 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






40. FAD-2 - NADP-3






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






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






43. Enter cells freely






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






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






46. Vitamin B1 - cofactor that aids in dehydrogenase mostly






47. Measures physical base pair distance






48. 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






49. 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






50. Can serve as a primer