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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. Only one carbon center is changed






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






3. RNA protein-complex






4. Enter cells freely






5. 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






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






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






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






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






10. Irreversible reaction that require ATP first part of glycolosis






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






12. Gene duplication






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






14. MRNA






15. Failure of chromosome pairs to separate during meiosis






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






17. Isoelectric point and MW






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






19. Krebs cycle enzyme






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






21. 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 -






22. Cleaves on C terminal side of lysine and arginine






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






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






25. 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






26. Circular and double stranded






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






28. Measures physical base pair distance






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






30. Repeated replication w/o cell division






31. Operon 1/2 - gene 1/6






32. Derived from golgi vesicles






33. 1e-14






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






35. Do not contain F factor






36. 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.






37. Makes Acetyl-CoA from pyruvate






38. Neutralizes H2O2 - found in lysosomes






39. 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






40. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






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






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






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






44. FAD-2 - NADP-3






45. Can serve as a primer

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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. Ser - Cys - Thr - Gln - Asn






48. Triglycerides - cholesterols - and phospholipids






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






50. 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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