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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. Enter cells freely






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






3. Circular and double stranded






4. PKa = pH






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






6. Can undergo both lytic and lysogenic cycle






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






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






9. 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.






10. Cleaves on C terminal side of lysine and arginine






11. RNA protein-complex






12. Gene duplication






13. 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






14. Failure of chromosome pairs to separate during meiosis






15. Neutralizes H2O2 - found in lysosomes






16. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






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






18. Operon 1/2 - gene 1/6






19. MRNA






20. Makes Acetyl-CoA from pyruvate






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






22. FAD-2 - NADP-3






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






24. 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.






25. Derived from golgi vesicles






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






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






28. Vitamin B1 - cofactor that aids in dehydrogenase mostly






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






30. Do not contain F factor






31. Ser - Cys - Thr - Gln - Asn






32. 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.






33. Val - Leu - Ile - Ala - Met






34. Phe - Trp - Tyr - Gly - Pro






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






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






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






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






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






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






42. Triglycerides - cholesterols - and phospholipids






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






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






45. 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






46. 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






47. Irreversible reaction that require ATP first part of glycolosis






48. Gene has multiple effects






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






50. 1e-14