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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. Gene has multiple effects






2. Operon 1/2 - gene 1/6






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






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






5. Can undergo both lytic and lysogenic cycle






6. Irreversible reaction that require ATP first part of glycolosis






7. Enter cells freely






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






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






10. 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 -






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






12. Phe - Trp - Tyr - Gly - Pro






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






14. Do not contain F factor






15. FAD-2 - NADP-3






16. Can serve as a primer

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17. Repeated replication w/o cell division






18. Failure of chromosome pairs to separate during meiosis






19. 1e-14






20. 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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21. Actin - myosin - and other muscle proteins






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






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






24. 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






25. Secondary messenger - used for intracellular signal transduction - such as transferring the effects of hormones like glucagon and adrenaline - which cannot pass through the cell membrane. It is involved in the activation of protein kinases and regula






26. MRNA






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






28. 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.






29. RNA protein-complex






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






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






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






33. Neutralizes H2O2 - found in lysosomes






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






35. 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






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






38. Makes Acetyl-CoA from pyruvate






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






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






41. Gene duplication






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






43. Triglycerides - cholesterols - and phospholipids






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






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






46. 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.






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






48. Enzymes in Krebs cycle that produce NADH






49. Krebs cycle enzyme






50. Only one carbon center is changed







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