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






2. Actin - myosin - and other muscle proteins






3. Cleaves on C terminal side of lysine and arginine






4. Enter cells freely






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






6. 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






7. Can serve as a primer

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






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






10. Neutralizes H2O2 - found in lysosomes






11. Phe - Trp - Tyr - Gly - Pro






12. Triglycerides - cholesterols - and phospholipids






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






14. MRNA






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. PKa = pH






17. Derived from golgi vesicles






18. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






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






20. RNA protein-complex






21. Only one carbon center is changed






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






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






24. Operon 1/2 - gene 1/6






25. Measures physical base pair distance






26. Vitamin B1 - cofactor that aids in dehydrogenase mostly






27. 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.






28. Ser - Cys - Thr - Gln - Asn






29. Can undergo both lytic and lysogenic cycle






30. 1e-14






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






32. Gene has multiple effects






33. Makes Acetyl-CoA from pyruvate






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






35. Irreversible reaction that require ATP first part of glycolosis






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






37. Failure of chromosome pairs to separate during meiosis






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






39. Enzymes in Krebs cycle that produce NADH






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






41. Do not contain F factor






42. Gene duplication






43. 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 -






44. 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






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






46. Isoelectric point and MW






47. 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






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






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






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