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






2. Cleaves on C terminal side of lysine and arginine






3. Derived from golgi vesicles






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






5. 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.






6. 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






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






8. Circular and double stranded






9. Val - Leu - Ile - Ala - Met






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






11. Triglycerides - cholesterols - and phospholipids






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






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






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






15. Gene has multiple effects






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






17. Vitamin B1 - cofactor that aids in dehydrogenase mostly






18. Can serve as a primer

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






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. Makes Acetyl-CoA from pyruvate






23. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






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






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






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






27. Neutralizes H2O2 - found in lysosomes






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






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






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






31. Failure of chromosome pairs to separate during meiosis






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






33. Enter cells freely






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






35. Only one carbon center is changed






36. Isoelectric point and MW






37. Repeated replication w/o cell division






38. 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.






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






40. Measures physical base pair distance






41. 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.






42. Irreversible reaction that require ATP first part of glycolosis






43. 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






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






45. Operon 1/2 - gene 1/6






46. 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 -






47. Krebs cycle enzyme






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






49. MRNA






50. 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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