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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. Circular and double stranded






2. Triglycerides - cholesterols - and phospholipids






3. Gene has multiple effects






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






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






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






7. 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






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






9. Repeated replication w/o cell division






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






11. Vitamin B1 - cofactor that aids in dehydrogenase mostly






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






13. Enter cells freely






14. Derived from golgi vesicles






15. Makes Acetyl-CoA from pyruvate






16. MRNA






17. 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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18. Cleaves on C terminal side of lysine and arginine






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






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






21. PKa = pH






22. 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






23. 1e-14






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






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






26. Isoelectric point and MW






27. 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 -






28. Neutralizes H2O2 - found in lysosomes






29. 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.






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






31. Irreversible reaction that require ATP first part of glycolosis






32. Ser - Cys - Thr - Gln - Asn






33. Operon 1/2 - gene 1/6






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. Phe - Trp - Tyr - Gly - Pro






36. RNA protein-complex






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






38. Actin - myosin - and other muscle proteins






39. Only one carbon center is changed






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






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






42. Can undergo both lytic and lysogenic cycle






43. Do not contain F factor






44. Val - Leu - Ile - Ala - Met






45. Failure of chromosome pairs to separate during meiosis






46. Can serve as a primer

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






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






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






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