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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. Ser - Cys - Thr - Gln - Asn






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






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






5. Gene duplication






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






7. 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.






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






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






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






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






12. Isoelectric point and MW






13. Phe - Trp - Tyr - Gly - Pro






14. Cleaves on C terminal side of lysine and arginine






15. Do not contain F factor






16. Enter cells freely






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






18. Vitamin B1 - cofactor that aids in dehydrogenase mostly






19. 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 -






20. Derived from golgi vesicles






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






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






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






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






25. Can serve as a primer

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26. Enzymes in Krebs cycle that produce NADH






27. Operon 1/2 - gene 1/6






28. Gene has multiple effects






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






30. 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






31. 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






32. RNA protein-complex






33. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






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






35. MRNA






36. Only one carbon center is changed






37. FAD-2 - NADP-3






38. Can undergo both lytic and lysogenic cycle






39. 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.






40. Irreversible reaction that require ATP first part of glycolosis






41. Failure of chromosome pairs to separate during meiosis






42. 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






43. Circular and double stranded






44. 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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45. PKa = pH






46. 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.






47. Actin - myosin - and other muscle proteins






48. Krebs cycle enzyme






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






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