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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.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

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. 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






2. Possess an F plasmid that also includes some DNA taken from the bacterial genome. Sometimes it is formed by incorrect excision from the chromosome


3. FAD-2 - NADP-3






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






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






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






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






8. 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.






9. Gene has multiple effects






10. Circular and double stranded






11. Enter cells freely






12. Measures physical base pair distance






13. 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






14. Gene duplication






15. Can undergo both lytic and lysogenic cycle






16. 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 -






17. Ser - Cys - Thr - Gln - Asn






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






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






20. Phe - Trp - Tyr - Gly - Pro






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






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






23. Neutralizes H2O2 - found in lysosomes






24. Irreversible reaction that require ATP first part of glycolosis






25. Isoelectric point and MW






26. Triglycerides - cholesterols - and phospholipids






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






28. Repeated replication w/o cell division






29. Only one carbon center is changed






30. Krebs cycle enzyme






31. Actin - myosin - and other muscle proteins






32. Vitamin B1 - cofactor that aids in dehydrogenase mostly






33. 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.






34. 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






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






36. Enzymes in Krebs cycle that produce NADH






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






38. 1e-14






39. Can serve as a primer


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






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






42. Failure of chromosome pairs to separate during meiosis






43. Derived from golgi vesicles






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






45. PKa = pH






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






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






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






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






50. Makes Acetyl-CoA from pyruvate