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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. Isoelectric point and MW






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






4. Vitamin B1 - cofactor that aids in dehydrogenase mostly






5. Operon 1/2 - gene 1/6






6. Irreversible reaction that require ATP first part of glycolosis






7. PKa = pH






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






9. 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.






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






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






12. MRNA






13. Cleaves on C terminal side of lysine and arginine






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






15. Neutralizes H2O2 - found in lysosomes






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






17. 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






18. Derived from golgi vesicles






19. Can serve as a primer

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20. 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.






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






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






23. 1e-14






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






25. Failure of chromosome pairs to separate during meiosis






26. Triglycerides - cholesterols - and phospholipids






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






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






29. Enzymes in Krebs cycle that produce NADH






30. Actin - myosin - and other muscle proteins






31. Val - Leu - Ile - Ala - Met






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






33. Can undergo both lytic and lysogenic cycle






34. 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 -






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






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






37. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






38. 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






39. Gene duplication






40. Makes Acetyl-CoA from pyruvate






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 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.






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






44. Ser - Cys - Thr - Gln - Asn






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






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






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






48. Krebs cycle enzyme






49. FAD-2 - NADP-3






50. Repeated replication w/o cell division