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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. Ser - Cys - Thr - Gln - Asn






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






3. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






4. Repeated replication w/o cell division






5. Vitamin B1 - cofactor that aids in dehydrogenase mostly






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






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






8. Triglycerides - cholesterols - and phospholipids






9. Derived from golgi vesicles






10. Makes Acetyl-CoA from pyruvate






11. Failure of chromosome pairs to separate during meiosis






12. Isoelectric point and MW






13. Can undergo both lytic and lysogenic cycle






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






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






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






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. Measures physical base pair distance






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






20. 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.






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






22. 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






23. Enzymes in Krebs cycle that produce NADH






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






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






26. Krebs cycle enzyme






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






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






29. 1e-14






30. FAD-2 - NADP-3






31. Operon 1/2 - gene 1/6






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






33. Phe - Trp - Tyr - Gly - Pro






34. Gene duplication






35. 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 -






36. Enter cells freely






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






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. 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.






40. 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






41. PKa = pH






42. Val - Leu - Ile - Ala - Met






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






44. Circular and double stranded






45. Do not contain F factor






46. 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.






47. Actin - myosin - and other muscle proteins






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






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






50. Can serve as a primer

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