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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. Repeated replication w/o cell division






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






3. Makes Acetyl-CoA from pyruvate






4. 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.






5. Gene has multiple effects






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






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






8. 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






9. Operon 1/2 - gene 1/6






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






11. Krebs cycle enzyme






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






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






14. Irreversible reaction that require ATP first part of glycolosis






15. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






16. 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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17. Actin - myosin - and other muscle proteins






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






19. 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






20. Derived from golgi vesicles






21. Do not contain F factor






22. Enzymes in Krebs cycle that produce NADH






23. Only one carbon center is changed






24. Isoelectric point and MW






25. RNA protein-complex






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






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






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






29. 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






30. MRNA






31. Circular and double stranded






32. Failure of chromosome pairs to separate during meiosis






33. Neutralizes H2O2 - found in lysosomes






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






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






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






37. Can serve as a primer

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






40. 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.






41. 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






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






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






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






45. PKa = pH






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






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






48. Measures physical base pair distance






49. Phe - Trp - Tyr - Gly - Pro






50. Enter cells freely