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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. 1e-14






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






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






4. Derived from golgi vesicles






5. Can serve as a primer


6. MRNA






7. Cleaves on C terminal side of lysine and arginine






8. 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 -






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. Possess an F plasmid that also includes some DNA taken from the bacterial genome. Sometimes it is formed by incorrect excision from the chromosome


11. Repeated replication w/o cell division






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






13. Irreversible reaction that require ATP first part of glycolosis






14. 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






15. Phe - Trp - Tyr - Gly - Pro






16. Makes Acetyl-CoA from pyruvate






17. Actin - myosin - and other muscle proteins






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






19. Ser - Cys - Thr - Gln - Asn






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






21. Enter cells freely






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






23. Neutralizes H2O2 - found in lysosomes






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






25. Enzymes in Krebs cycle that produce NADH






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






27. Failure of chromosome pairs to separate during meiosis






28. Only one carbon center is changed






29. PKa = pH






30. Do not contain F factor






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






32. FAD-2 - NADP-3






33. Krebs cycle enzyme






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






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






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






37. RNA protein-complex






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






39. Gene duplication






40. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






41. 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






42. 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.






43. Vitamin B1 - cofactor that aids in dehydrogenase mostly






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






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






46. Measures physical base pair distance






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






48. Circular and double stranded






49. 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.






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