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






2. Measures physical base pair distance






3. Isoelectric point and MW






4. Do not contain F factor






5. Repeated replication w/o cell division






6. FAD-2 - NADP-3






7. Derived from golgi vesicles






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






9. 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






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






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






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






13. Makes Acetyl-CoA from pyruvate






14. RNA protein-complex






15. Cleaves on C terminal side of lysine and arginine






16. Enzymes in Krebs cycle that produce NADH






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






18. Failure of chromosome pairs to separate during meiosis






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






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






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






22. Val - Leu - Ile - Ala - Met






23. 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.






24. 1e-14






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






26. MRNA






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






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






29. 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






30. 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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31. Operon 1/2 - gene 1/6






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






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






34. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






35. 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






36. Circular and double stranded






37. Can serve as a primer

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






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






40. Phe - Trp - Tyr - Gly - Pro






41. Gene has multiple effects






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






43. 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.






44. 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.






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






46. Gene duplication






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






48. Vitamin B1 - cofactor that aids in dehydrogenase mostly






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