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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. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






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






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






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






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






6. Triglycerides - cholesterols - and phospholipids






7. 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






8. Val - Leu - Ile - Ala - Met






9. Can serve as a primer

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10. Actin - myosin - and other muscle proteins






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






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






13. 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.






14. Repeated replication w/o cell division






15. Circular and double stranded






16. Makes Acetyl-CoA from pyruvate






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






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






19. Isoelectric point and MW






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






21. 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.






22. Enter cells freely






23. Gene has multiple effects






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






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






26. 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






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






28. Ser - Cys - Thr - Gln - Asn






29. Krebs cycle enzyme






30. Enzymes in Krebs cycle that produce NADH






31. PKa = pH






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






33. Phe - Trp - Tyr - Gly - Pro






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






35. Cleaves on C terminal side of lysine and arginine






36. MRNA






37. 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






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






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






40. Only one carbon center is changed






41. Measures physical base pair distance






42. FAD-2 - NADP-3






43. Can undergo both lytic and lysogenic cycle






44. Derived from golgi vesicles






45. Do not contain F factor






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






47. Operon 1/2 - gene 1/6






48. RNA protein-complex






49. 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






50. 1e-14