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






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






3. 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.






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






5. Can undergo both lytic and lysogenic cycle






6. FAD-2 - NADP-3






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






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






9. 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 -






10. Do not contain F factor






11. Makes Acetyl-CoA from pyruvate






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






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






14. 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






15. 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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16. Cis faces the ER and trans faces the plasma membrane






17. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






18. RNA protein-complex






19. 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.






20. Enzymes in Krebs cycle that produce NADH






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






22. 1e-14






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






24. Triglycerides - cholesterols - and phospholipids






25. Vitamin B1 - cofactor that aids in dehydrogenase mostly






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






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






28. Gene has multiple effects






29. Irreversible reaction that require ATP first part of glycolosis






30. Actin - myosin - and other muscle proteins






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






32. Cleaves on C terminal side of lysine and arginine






33. Repeated replication w/o cell division






34. 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






35. Operon 1/2 - gene 1/6






36. Only one carbon center is changed






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






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






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






40. 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






41. Isoelectric point and MW






42. Gene duplication






43. Ser - Cys - Thr - Gln - Asn






44. Can serve as a primer

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






46. Failure of chromosome pairs to separate during meiosis






47. 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.






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






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






50. Phe - Trp - Tyr - Gly - Pro