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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. Irreversible reaction that require ATP first part of glycolosis






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






3. 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.






4. Repeated replication w/o cell division






5. PKa = pH






6. Derived from golgi vesicles






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






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






10. 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






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






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






13. Krebs cycle enzyme






14. 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 -






15. Vitamin B1 - cofactor that aids in dehydrogenase mostly






16. Can undergo both lytic and lysogenic cycle






17. Gene has multiple effects






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






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






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






21. Enzymes in Krebs cycle that produce NADH






22. Cleaves on C terminal side of lysine and arginine






23. 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






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






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






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






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






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






29. MRNA






30. 1e-14






31. Can serve as a primer

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32. Do not contain F factor






33. Only one carbon center is changed






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






35. RNA protein-complex






36. Measures physical base pair distance






37. Enter cells freely






38. 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.






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






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






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






42. Triglycerides - cholesterols - and phospholipids






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






44. 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.






45. Ser - Cys - Thr - Gln - Asn






46. Val - Leu - Ile - Ala - Met






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






48. 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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49. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






50. Gene duplication