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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. 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






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






3. Can undergo both lytic and lysogenic cycle






4. Gene has multiple effects






5. 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






6. Derived from golgi vesicles






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






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






9. PKa = pH






10. Phe - Trp - Tyr - Gly - Pro






11. Circular and double stranded






12. 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






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






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






15. Failure of chromosome pairs to separate during meiosis






16. Enter cells freely






17. MRNA






18. FAD-2 - NADP-3






19. Irreversible reaction that require ATP first part of glycolosis






20. 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 -






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






22. 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.






23. Cleaves on C terminal side of lysine and arginine






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






25. Gene duplication






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






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. Measures physical base pair distance






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






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






31. Val - Leu - Ile - Ala - Met






32. Only one carbon center is changed






33. 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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34. Isoelectric point and MW






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






36. Vitamin B1 - cofactor that aids in dehydrogenase mostly






37. Do not contain F factor






38. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






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






40. Makes Acetyl-CoA from pyruvate






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






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






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






44. Repeated replication w/o cell division






45. Neutralizes H2O2 - found in lysosomes






46. Operon 1/2 - gene 1/6






47. 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






48. Ser - Cys - Thr - Gln - Asn






49. 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.






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