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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.
  • 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. Measures physical base pair distance






2. Circular and double stranded






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






4. Only one carbon center is changed






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






6. Krebs cycle enzyme






7. Isoelectric point and MW






8. RNA protein-complex






9. Operon 1/2 - gene 1/6






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






11. 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






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






13. 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.






14. Vitamin B1 - cofactor that aids in dehydrogenase mostly






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






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






17. Do not contain F factor






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






19. Enter cells freely






20. 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.






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






22. Repeated replication w/o cell division






23. MRNA






24. Derived from golgi vesicles






25. Cleaves on C terminal side of lysine and arginine






26. Triglycerides - cholesterols - and phospholipids






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






28. PKa = pH






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. 1e-14






31. Can serve as a primer


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






33. Failure of chromosome pairs to separate during meiosis






34. Ser - Cys - Thr - Gln - Asn






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






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






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






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






39. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






40. 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






41. Can undergo both lytic and lysogenic cycle






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






43. Gene duplication






44. 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






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






46. Phe - Trp - Tyr - Gly - Pro






47. 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.






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






49. Val - Leu - Ile - Ala - Met






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