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






3. Ser - Cys - Thr - Gln - Asn






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






5. Do not contain F factor






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






7. Cleaves on C terminal side of lysine and arginine






8. Repeated replication w/o cell division






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






10. Neutralizes H2O2 - found in lysosomes






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






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






13. 1e-14






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






15. 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 -






16. RNA protein-complex






17. Measures physical base pair distance






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






19. Circular and double stranded






20. Makes Acetyl-CoA from pyruvate






21. MRNA






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






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






25. Operon 1/2 - gene 1/6






26. 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.






27. PKa = pH






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






29. Triglycerides - cholesterols - and phospholipids






30. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






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






32. Only one carbon center is changed






33. Enter cells freely






34. Phe - Trp - Tyr - Gly - Pro






35. 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






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






37. 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






38. Gene duplication






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






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






41. Actin - myosin - and other muscle proteins






42. Derived from golgi vesicles






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






44. Krebs cycle enzyme






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






46. 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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47. Can undergo both lytic and lysogenic cycle






48. 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.






49. Val - Leu - Ile - Ala - Met






50. FAD-2 - NADP-3







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