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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. Val - Leu - Ile - Ala - Met






2. Failure of chromosome pairs to separate during meiosis






3. Cleaves on C terminal side of lysine and arginine






4. Krebs cycle enzyme






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






6. Gene has multiple effects






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






8. Vitamin B1 - cofactor that aids in dehydrogenase mostly






9. Derived from golgi vesicles






10. Can undergo both lytic and lysogenic cycle






11. Triglycerides - cholesterols - and phospholipids






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






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






14. Ser - Cys - Thr - Gln - Asn






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. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






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






18. 1e-14






19. Can serve as a primer

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






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






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






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






24. 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.






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






26. Neutralizes H2O2 - found in lysosomes






27. Isoelectric point and MW






28. RNA protein-complex






29. 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






30. Only one carbon center is changed






31. Circular and double stranded






32. MRNA






33. 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






34. FAD-2 - NADP-3






35. Irreversible reaction that require ATP first part of glycolosis






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






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






38. Operon 1/2 - gene 1/6






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






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






41. PKa = pH






42. Measures physical base pair distance






43. 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 -






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






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






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






47. 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






48. 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






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






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







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