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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. Neutralizes H2O2 - found in lysosomes






2. 1e-14






3. Actin - myosin - and other muscle proteins






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






5. Cleaves on C terminal side of lysine and arginine






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






7. PKa = pH






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






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






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






11. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






12. Makes Acetyl-CoA from pyruvate






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






15. 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.






16. Val - Leu - Ile - Ala - Met






17. Derived from golgi vesicles






18. 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.






19. Gene has multiple effects






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






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






22. Do not contain F factor






23. Phe - Trp - Tyr - Gly - Pro






24. Gene duplication






25. Enter cells freely






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






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






28. Can serve as a primer

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29. Krebs cycle enzyme






30. 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






31. 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






32. Triglycerides - cholesterols - and phospholipids






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






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






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






36. Only one carbon center is changed






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






38. Failure of chromosome pairs to separate during meiosis






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






40. 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.






41. Operon 1/2 - gene 1/6






42. Repeated replication w/o cell division






43. Measures physical base pair distance






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






45. Enzymes in Krebs cycle that produce NADH






46. RNA protein-complex






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. MRNA






49. Isoelectric point and MW






50. Can undergo both lytic and lysogenic cycle






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