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






2. 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






3. Val - Leu - Ile - Ala - Met






4. FAD-2 - NADP-3






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






6. Measures physical base pair distance






7. 1e-14






8. Derived from golgi vesicles






9. 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.






10. Triglycerides - cholesterols - and phospholipids






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






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






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






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






15. Actin - myosin - and other muscle proteins






16. 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.






17. Isoelectric point and MW






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






19. 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






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






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. PKa = pH






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






24. Enter cells freely






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. Can serve as a primer


27. Only one carbon center is changed






28. RNA protein-complex






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






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






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






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


33. Gene has multiple effects






34. Circular and double stranded






35. Ser - Cys - Thr - Gln - Asn






36. Can undergo both lytic and lysogenic cycle






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






38. Neutralizes H2O2 - found in lysosomes






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






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






41. Repeated replication w/o cell division






42. MRNA






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






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






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






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






47. Krebs cycle enzyme






48. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






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






50. Irreversible reaction that require ATP first part of glycolosis