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






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






3. Repeated replication w/o cell division






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






5. 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.






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






7. Triglycerides - cholesterols - and phospholipids






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






9. RNA protein-complex






10. Ser - Cys - Thr - Gln - Asn






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






12. Derived from golgi vesicles






13. 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






14. Do not contain F factor






15. Circular and double stranded






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






17. Enter cells freely






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






19. 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






20. Vitamin B1 - cofactor that aids in dehydrogenase mostly






21. Actin - myosin - and other muscle proteins






22. Neutralizes H2O2 - found in lysosomes






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






24. 1e-14






25. Can undergo both lytic and lysogenic cycle






26. 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.






27. Can serve as a primer

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






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






30. MRNA






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






32. Operon 1/2 - gene 1/6






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






35. PKa = pH






36. Krebs cycle enzyme






37. 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 -






38. Cleaves on C terminal side of lysine and arginine






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






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






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






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






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






44. Gene duplication






45. 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






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






47. FAD-2 - NADP-3






48. Val - Leu - Ile - Ala - Met






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






50. 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.